Floyd Mayweather whipped his friend Earl Hayes into a frenzy over his wife's infidelity ... to the point Hayes gunned her down ... and now the LAPD wants to sit the boxer down for questioning ... multiple sources tell TMZ.

TMZ broke the story ... Floyd was on FaceTime with his rapper friend Monday morning when the shots were fired. Now we're told, Floyd was telling Hayes he should leave his wife, Stephanie Moseley -- a well-known backup dancer and star of VH1's "Hit the Floor" -- because she was bad for his career.

As we reported, Hayes was distraught over what he believed was repeated infidelity, including a fling he said Stephanie had with Trey Songz.

One Mayweather source says Floyd challenged Hayes, saying he was weak for not leaving her.

At that point, as Floyd was on FaceTime, Hayes went off and said he was going to gun down Stephanie. We're told when the boxer realized Hayes was going to shoot Stephanie, he begged Hayes not to go through with it.

Our law enforcement sources say Hayes went into the bathroom and fired 10 to 12 shots as Stephanie was taking a bath. We're told she was hit multiple times.

Neighbors who heard the shots called the LAPD and cops rushed to the scene, but when they got to the door they heard another shot and retreated. That shot was Hayes taking his own life.

The SWAT team showed up and broke down the door. Cops found Stephanie's body in the bathtub and Hayes was in the bedroom.

We're now told the LAPD wants to interview Floyd ... presumably because he was a witness to the murder-suicide.

Earl Hayes -- the man who cops say shot his famous wife to death Monday and then killed himself -- was haunted by her infidelity ... in particular what he said was a fling she had with singer Trey Songz.

As TMZ reported, Stephanie Moseley -- the star of VH1's "Hit the Floor" -- was gunned down in their L.A. apartment as neighbors heard her screaming. Shots rang out, the SWAT team came, busted through the door and discovered the 2 bodies.

Sources connected with Hayes tell us ... around 2 years ago he separated from Stephanie because of what he says was her affair with Songz. They got back together but, as one friend put it, "He was crushed and never got over it." We're told he frequently brought up Songz.

Hayes accused Moseley of having multiple affairs with various other entertainers. She was a backup dancer who worked with numerous famous singers, including Chris Brown and Usher, but we're told Hayes never mentioned them as a source of conflict.

Hayes and Moseley married in 2008 and his friends say he loved her and tried rationalizing staying together.

TMZ broke the story ... Floyd Mayweather was on FaceTime with Hayes when he flew into a rage over Moseley's alleged infidelity and the boxer was witness to the murder/suicide.

We reached out to Songz and got no word back, but Monday night he tweeted this.

Just hours after witnessing a murder/suicide via FaceTime, Floyd Mayweather decided to get out of his house to sit courtside at the L.A. Clippers basketball game Monday night.

Floyd actually appeared to be in a pretty decent mood considering the circumstances ... shaking hands and talking with Clippers stars Chris Paul and Jamal Crawford before they took on the Phoenix Suns at Staples Center.

As TMZ first reported, Floyd was on the phone Monday morning with rapper Earl Hayes when he killed his wife, VH1 star Stephanie Moseley, and then himself.

Floyd Mayweather is reeling tonight ... because he was on FaceTime with one of his best friends when the guy pulled out a gun, shot his wife and then killed himself ... TMZ has learned.

Sources tell us ... rapper Earl Hayes called Floyd on FaceTime Monday morning in a rage, over claims his wife -- VH1 star Stephanie Moseley -- had been unfaithful.

According to our Floyd sources, Earl said he was going to kill his wife. The champ was pleading with him to get a grip ... to no avail. Floyd will not say how much he saw, but he acknowledges he was a witness and heard everything.

2:30 PM PT -- We've learned Moseley and Hayes were married.

2:00 PM PT -- Law enforcement tells TMZ, Hayes shot Moseley and then turned the gun on himself.

"Hit the Floor" star Stephanie Moseley is dead .... after her rapper husband -- a member of Floyd Mayweather's Money Team -- shot her and then killed himself ... TMZ has learned.

We're told residents at a swanky L.A. apartment complex near The Grove heard shots ring out early Monday morning. The SWAT team raced to the scene and knocked down the door of an apartment ... and found 2 people shot to death.

The rapper Earl Hayes -- who was once signed to Mayweather's record label -- often partied with Floyd. Moseley has been a backup dancer with numerous singers, including Chris Brown and Britney Spears.

Residents heard a woman screaming in the apartment before shots rang out.

Sources connected with Moseley and Hayes tell TMZ ... he had accused her of infidelity with a famous singer.

Chris Brown just Instagrammed, "RIP baby girl. Danced with me on tour and was always the coolest person. My prayers go out to you and HAZE family."

We got a couple of Gordon Ramsay's young students from "Master Chef Junior" -- y'know that show where the kids cook until they cry! Yeah ... if you're into that kinda thing, you might be a horrible person.

But the little chefs sure are cute.

Georgia prosecutors clearly don't have a sense of humor -- they can't even tell the difference between a real death threat and a funny one ... so claims the guy who threatened to kill Mama June and Pumpkin.

Andrew Kurt Summers -- who now faces felony charges of making terroristic threats -- went on Facebook and threatened to shoot June and her daughter.

But Summers tells TMZ ... he was never serious. It was simply, as he puts it, "a joke, a dumb mistake."

Summers says he has no ill will toward the family. He says he was trolling her Facebook page because of the Mark McDaniel situation. As for what he specifically wrote ... he won't say because the case is going to trial. Nor would he explain how a threat to shoot someone is funny.

Summers was in proximity of the Honey Boo Boo clan. He lives just outside Atlanta, 2 hours from their home.

He's freaked out about the prospect of prison, saying he's a law abiding citizen with a clean record.

A guy threatened to shoot Mama June and Pumpkin too ... and he's been charged with making terroristic threats ... TMZ has learned.

Cops in McIntyre, GA tell us ... June was threatened on her Facebook page. June tells us he threatened to shoot both her and Pumpkin.

Police got a warrant for Andrew Kurt Summers, who turned himself in Monday. He's been released on $15K bail.

Summers faces the felony charge of making terroristic threats.

Mama June says she takes threats against her and her kids very seriously.

Well, not ALL threats ...

A Chinese man -- considered the Asian Ryan Seacrest -- has filed a lawsuit alleging the Kardashians trashed his house in the worst way -- they told America it had bad feng shui.

Jianxiang Huang and Li Weihong bought the house in Calabasas in 2012 ... right next door to Kourtney. They left it vacant and asked their realtor to maintain it until they eventually moved in.

Fast forward to last August, when Jianxiang returned to America to find the house in what he believed was shambles -- there was oil on the backsplash, metal bowls were not stacked properly, sugar and salt were "significantly used" and there were even Pittsburgh Steelers slippers in the closet!

Jianxiang sued his realtor, and dropped a BOMBSHELL ... a neighbor told Jianxiang his house was on an episode of "Keeping Up the with Kardashians" in January, when Khloe was looking for a home to escape the Lamar drama. Cameras were rolling when the fam trashed the house, saying it had bad feng shui.

Jianxiang was humiliated, saying in his lawsuit 2 million people worldwide -- plus his neighbor -- saw the Kardashians bring great dishonor to his house.

He's suing the realtor for all sorts of things, including "aiding and abetting a trespass." The Kardashians were not sued.

"Real Housewives of Atlanta" star Mama Joyce regrets her toxic relationship with her in-law Miss Sharon, but still ... she has no plans to go to the funeral.

Mama Joyce famously belittled her son-in-law Todd Tucker and his mom Sharon Tucker on the show ... claiming he was money hungry and Sharon was a prostitute.

But now Joyce tells TMZ she is sorry for attacking Sharon by repeating gossip (which turned out to be false) -- and wishes they'd patched things up before Miss Sharon died on Tuesday.

Silver lining? Kandi Burruss' mom says she wants to have a better relationship with Todd.

MJ added she won't attend the funeral out of respect for Miss Sharon's friends and family. She knows a lot of people would be pissed if she showed her face ... so instead she's going to send flowers.

Mike "The Situation" Sorrentino -- who was once rolling in cash -- is now so desperate for money he's literally selling the tires off his car.

Sitch is auctioning off the custom wheels on his Ferrari on eBay. There's a good reason he needs the money ... he owes millions in taxes and is being criminally prosecuted for tax fraud.

Under the category "every little bit counts," there have been 67 bids at the time of this post and the frontrunner is willing to shell out $4,050.

He wants more than that before he parts with the rubber, but unclear how much.

It has not been a very Goodyear.

Teresa Giudice can't even do bankruptcy right ... and she blames it on her lawyer whom she is now suing.

Teresa claims in her new lawsuit -- obtained by TMZ -- he was a slacker who never even met with her prior to filing bankruptcy docs.

She also says he was sloppy as hell, not bothering to list key assets such as her cars, her rental property income and various bank accounts.

Giudice claims he's the reason she got nailed with bankruptcy fraud and that's why she's going to prison for 15 months.

Teresa says it's a classic case of malpractice, and she wants minimum 5 mil. By the way ... if you see any stories later today saying she's suing for $15 mil ... that's wrong. She makes the same claim 3 times.

NeNe Leakes and Kim Zolciak will make each other squirm on live TV ... forced to come clean about some very personal issues.

Production sources tell us NeNe and Kim have agreed to play Andy Cohen's game, "Plead the 5th" ... where they're asked 3 questions and they can only plead the 5th to one.

Andy typically asks the questions, but this time the girls will grill each other.

Six years ago, NeNe openly talked about Kim having a sugar daddy and cheating on her man, triggering an iconic club house showdown ... after Kim called in to confront NeNe.

We're told NO questions are off-limits. That and a few drinks should make it interesting.

Kandi Burruss' mother-in-law, Sharon Tucker, died in NYC Tuesday ... after suffering a stroke one day earlier.

Todd Tucker immediately flew from ATL to NY after getting the news about his mother's stroke ... according to sources close to Kandi and her husband. Todd's mom frequently appeared on "Real Housewives of Atlanta" ... and went by Miss Sharon on the show.

She slipped into a coma overnight while hospitalized after the stroke. We're told Kandi and Todd were by her side when Miss Sharon died.

If Snooki and new hubby Jionni LaValle left their wedding reception in a car with tin cans attached, it's a safe bet he didn't drive ... because we found he was on the heels of a drunk driving arrest.

Jionni spent the first weekday as a married man in court, where he copped a plea in his criminal case. He was arrested August 7 on Interstate 80 in Totowa, NJ at 3:30 AM after cops noticed him driving erratically.

Jionni pled guilty to DUI on Monday and had 2 other charges -- unsafe lane change and careless driving -- dismissed. His license was revoked for 3 months and he has to attend a drug and alcohol education class.

Snooki can relate ... she was arrested in 2010 for public drunkenness on the Jersey Shore.