Nurse!

Melissa Rivers will sue the medical center where Joan died and the doctors as well because it's the only way she can find out what really happened to her mom.

Sources connected to the Rivers family tell TMZ ... after the New York Dept. of Health and Human Services came out with its findings that Yorkville Endoscopy LLC was "deficient" in surgical services and medical staff ... Melissa tried to find out the root of the problems and if they caused her mom's death, but she was shut down.

We're told Melissa got advice from her lawyers ... the only way to know precisely what happened is to file a lawsuit, which entitles her to force doctors and facility staff to sit for sworn depositions and answer questions about what happened the day Joan stopped breathing.

Melissa, we're told, is frustrated because it's apparent the facility and the Dept. of Health know exactly what happened, so her only recourse is court.

Elizabeth Pena -- who became famous playing Ritchie Valens' brother's baby mama in "La Bamba" -- died from complications from alcohol abuse.

According to the death certificate -- obtained by TMZ -- Pena suffered from cirrhosis of the liver "due to alcohol." She had the disease for months, but it became acute shortly before her death.

The death certificate says the 55-year-old had acute gastrointestinal bleeding hours before her death, which caused her heart to stop.

Pena died October 14th at Cedars-Sinai Medical Center in L.A.

Tori Spelling had several of the symptoms, and got treated like an Ebola patient this weekend when she was hospitalized with a bunch of illnesses ... TMZ has learned.

Sources tell us Tori was running a fever, coughing uncontrollably, and having trouble breathing ... when she was taken to Cedars Sinai Hospital. We're told Tori was quarantined from other patients, and medical staff took precautions while treating her.

While it sounds scary ... we're told it's NOT Ebola -- but instead Tori was admitted for a severe case of bronchitis with a sinus infection. Doctors are running blood tests, and a lung specialist is going to check out her bronchitis.

We're told Tori had to cancel a scheduled press tour for the 2nd season of her reality show.

Rob Lowe became the handsomest piece of shark bait in the water this weekend -- when he gashed his leg open during a surf session gone bad ... and the blood came pouring out.

As you can see in the pic, Lowe ripped open his right knee -- but before he got stitched up, the guy posed for a Instagram pic ... with the blood still streaming down his leg.

In fact, 50-year-old Lowe was so impressed with his wound, he tweeted ... "The amount of blood that can unwantedly come out of one's body is amazing."

Hot.

If you're looking to stay safe from Ebola in style ... Cam'ron has you covered for less than $20 -- or at least that's what he's advertising.

The rapper's line of Ebola masks -- with his mug plastered across the front -- start shipping in a few weeks ... and while the price might be right, the science behind it isn't.

The website is selling them for $19.99 and says they offer a "soft, fluid protection barrier while the cellulose inner facing assures comfort and breathability." All of that might be true, but it ignores the fact Ebola isn't an airborne virus -- so, the mask is pretty much useless ... for now.

Still, looks cool.

We may never know exactly what killed Joan Rivers ... because a decision was made NOT to do an autopsy ... TMZ has learned.

Sources connected to the NYC Medical Examiner tell us ... Melissa Rivers was despondent when Joan died and told doctors she did not want an autopsy performed. According to New York law, doctors will honor such a request if there's no evidence of criminality associated with the death.

The Medical Examiner has concluded the cause of death was deprivation of oxygen which caused irreversible brain damage. We're told they determined the "predictable" complication involved the procedure itself and not Propofol.

Here's the problem ... we're told without an autopsy it's impossible to pinpoint the nature of the problem. As one source said, an autopsy might reveal a puncture in the throat or other trauma.

The only way Joan's family might get a definitive answer is if a doctor or nurse owns up to a possible mistake ... and even then it's just someone's word.

So the precise cause of Joan's death may forever stay a mystery.

Country singer Dustin Lynch got a beer can chucked AT HIS FACE during a concert Friday night ... oh, and did we mention this went down at something called the Mullet Festival?

Lynch was playing the headlining gig at the Boggy Bayou Mullet Festival in Niceville ... when some not so nice person threw a can at his noggin and made contact.

Lynch tries to locate the thrower to no avail ... and shortly after the concert tweeted he had to go to the hospital to get stitches.

Former "American Idol" contestant Joanne Borgella died Saturday at the age of 32 ... after fighting for the past year against what she described as a "rare case" of cancer.

Borgella's family broke the news on her Facebook page Saturday ... saying the singer passed away around 5:45 A.M. -- adding, "Her faith, courage and strength were unshaken throughout every obstacle she encountered."

Joanne was the first winner of "Mo'Nique's Fat Chance" using the name "Miss F.A.T." in 2005. In 2008, she was on Season 7 of "A.I." and made it into the top 12 girls category.

Last year, Joanne said her cancer was rare because it had spread to her chest -- the family's post on Facebook described it as endometrial cancer ... a form of cancer that attacks the lining of the womb.

Borgella last updated her social media pages about her battle in September ... and said she was going back to radiation for 2 more procedures.

T.I. is either the ultimate entertainer, or dangerously naive -- he's touched down in Africa for a concert he says must go on ... Ebola or no Ebola.

Sources close to the situation tell TMZ ... T.I. landed in Tanzania on Friday to headline the Serengeti Fiesta this weekend -- and his management team insists there is no risk of an outbreak, since the country has yet to have had a single Ebola case.

It's true ... Tanzania's on the far east coast of Africa, while the hardest hit countries are in West Africa. It's kinda like canceling a trip to Maine because Ebola's in Dallas.

One not-so-fun fact for T.I. -- just last month an Oxford University study said Tanzania is one of the top 15 countries in Africa at risk for animal-to-human transmission of Ebola.

If T.I. does get worried ... we suggest crowd surfing the way Akon did 2 weeks ago in the Congo.

If you've ever made fun of Bono for wearing sunglasses inside, prepare to feel like an ass -- because the singer just revealed the only reason he's been doing it for 2 decades is because he has glaucoma.

During a recent taping of the "Graham Norton Show" Bono said he's been suffering from the condition for 20 years ... and finally felt it was time to come out with his eye condition.

Bono said he's been getting treatments and will be fine, adding ... "You're not going to get this out of your head now and you will be saying, 'Ah, poor old blind Bono.'"

Still no excuse for putting U2's new album on the cloud though.

Boxing legend Leon Spinks was taken down after going a few round with some chicken wings ... TMZ Sports has learned.

We broke the story ... Spinks is currently hospitalized in Nevada -- and now, we've learned Leon's medical problems can all be traced back to a chicken wing meal gone bad.

Leon's attorney tells us Spinks is known to his friends as the "Chicken Wing King" -- and during a recent meal, accidentally swallowed a bone ... which got stuck in his intestine.

Spinks has undergone two surgical procedures so far -- with a 3rd scheduled for later today. We're told Leon is conscious and on the mend.

We're also told ... Leon's current wife Brenda is adamant she has power of attorney over Leon -- despite a claim to the contrary by Leon's ex-wife Betty.

As we previously reported, Betty says Leon empowered her to call the shots regarding his health after they divorced back in 2004.

But Leon's attorney tells us, "Brenda and Leon have a power of attorney agreement. Betty's power of attorney was expressly revoked by Leon."

Pretty cool moment from Ellen DeGeneres -- when she hooked up Cincinnati Bengals player Devon Still with a $10,000 DONATION to help his 4-year-old daughter in her fight against cancer.

Still's story has captivated the nation -- his daughter Leah was diagnosed with Neuroblastoma stage 4 cancer in June, and doctors have told her father she has about a 50% chance of survival. Still says she's fighting like hell.

The Bengals announced proceeds of his #75 jersey sales would be used to help raise awareness for pediatric cancer research ... and so far, more than $1 million has been raised.

But Ellen wasn't just wearing his jersey when Still appeared on her show Friday -- she also hooked the NFL player up with a $10k donation to Children's Hospital of Philadelphia ... where his daughter Leah is being treated.

There's more ... Ellen also said she'll be getting celebs to sign her jersey which she plans to auction off to raise even more money for Leah's fight.

Two strippers won't be hitting up the champagne room for the next 21 days because they're in Ebola quarantine ... but once they get out, would you still let them rub their junk on your lap?

Texas flop jockeys Axl Goode and Taylor Cole say they sat 3-feet from Ebola patient, nurse Amber Vinson -- during a flight from Cleveland to Dallas on Monday -- so they called the CDC.

The buffed out strippers were on hold for 81 minutes before they finally got an official on the line. After that, they were placed on a 21 day voluntary quarantine.

Someone did something wrong in the medical procedure that led to Joan Rivers' death ... this according to one source involved in the investigation.

The Medical Examiner has said the death was the result of a therapeutic, predictable complication. Sources tell us ... the complication did NOT involve the Propofol administered to Joan. The complication was the result of the procedure itself.

The source connected to the investigation tells TMZ ... the procedure was actually completed when Joan suffered brain damage from a lack of oxygen.

Our source says there were no "underlying causes or contributing factors" involving Joan's health, and it appears someone was at fault. There's still an investigation and a big issue is whether her oxygen levels were being properly monitored.

We're told people in Joan's life have keyed in on the word "predictable" ... they think it could be a focal point in a possible malpractice action because predictable could also mean preventable.

War Machine tried to kill himself in his Las Vegas jail cell this week ... but his attempt was foiled by a corrections officer.

Law enforcement sources tell TMZ ... Tuesday night around 9:30 an officer was walking by War Machine's cell in Clark County Jail. The officer saw him sitting on the ground with his feet up on the bunk bed. When the officer called to him he was unresponsive.

The officer went into the cell and found the ex-MMA fighter had a piece of linen around his neck which was tied to the leg of the bed -- and his face was purple. The officer cut the linen, removed it ... and we're told War Machine's breathing became less strained and he attempted to speak.

He's currently in a medical isolation cell on suicide watch. We're told officers found what appeared to be suicide notes in the cell.

War Machine is in jail awaiting trial for the attempted murder of his ex-girlfriend, porn star Christy Mack, and her friend Corey Thomas.

War Machine's attorney tells us one of the letters found in the cell was written to Christy.