NFL QB Steve McNair had a blood alcohol level of twice the legal limit and his mistress had traces of pot, authorities now say.

Cops say it looks like McNair was asleep when Sahel Kazemi shot him to death, twice in the head and twice in the chest.

Slain QB Steve McNair may have left a mess behind, because a legal fight over his estate seems to be taking shape.

McNair did not leave a will. His widow, Mechelle, has been named administrator of his estate. She's named her two sons, Tyler and Trenton, as heirs.

But here's the problem. McNair has two older sons from a prior relationship -- Steven McNair Jr. and Steven O'Brian Koran McNair. Mechelle did not list either child as an heir.

Under Tennessee law, Mechelle gets 1/3 of the estate and the remaining 2/3 is split evenly among the heirs.

We don't know why Mechelle failed to mention the other two kids. There are reports she's not convinced McNair fathered the two older kids, even though one of them was getting $500 a month in child support from the NFL'er.

And the plot thickens ... McNair's agent is being coy about the possibility a will really does exist.

Stay tuned...

The guy who allegedly sold the gun that killed Steve McNair -- a man named Adrian J. Gilliam Jr. (left) -- has been arrested by ATF agents in Nashville, Tenn.

McNair's mistress, Sahel Kazemi, bought the gun on July 2 -- two days before she murdered Steve and then killed herself.

Prosecutors are expected to announce the charges against Gilliam this afternoon.

UPDATE: Gilliam has been charged with illegally possessing a firearm. A big no-no for the convicted felon.

Gilliam was convicted of murder and attempted armed robbery in 1993.

Talk about a morbid coincidence: 3 months before he was killed in an apparent murder-suicide, NFL QB Steve McNair filmed a suicide prevention PSA.

The spot hasn't aired -- and the Tennessee Department of Mental Health and Developmental Disabilities says they won't be releasing it because it is now "not only inappropriate but doesn't serve the community."

Sahel Kazemi was busted for DUI two days before she murdered Steve McNair and then committed suicide -- and cops just released dashcam footage of the incident.



Sahel was initially pulled over for speeding on July 2, then forced to take field sobriety tests -- which she failed. Cops allowed Steve and another man in the Escalade to leave in a taxi -- but Steve showed up at the jail later on to bail out Sahel.

The DUI is one of a handful of circumstances -- including Sahel's belief Steve had another lover -- that cops believe led to the shootings.

The 911 tape made after Steve McNair and Sahel Kazemi were found dead was just released by the Metro Nashville Police Department.

Steve's friend -- Robert Gaddy -- made the call and was hysterical as the dispatcher desperately tried to get information from him. Steve's roommate Wayne Neely initially discovered the bodies and then notified Gaddy to call 911.

Cops announced today they believe Sahel murdered Steve and then killed herself.

Click here... it's not over yet

In a presser today, police in Nashville, TN revealed the following about the death of Steve McNair -- an investigation they're saying "clearly points to a murder-suicide."

- Sahel Kazemi told friends her life was "all messed up" and she was "going to end it all" before the incident.

- Kazemi was extremely stressed -- she had two car payments, her roommate was moving out and she recently started thinking McNair was seeing someone else (he was actually married).

- The shell casings match the weapon purchased by Sahel and there was trace evidence on her left hand.

- The lack of struggle, Steve's position on the couch and the trajectory of the bullet leads police to believe McNair was "likely asleep" on the couch when he was shot.

We just spoke with Tennessee assistant medical examiner Dr. Feng Li, who tells us preliminary test results in the Steve McNair death show Sahel Kazemi fired the gun that killed both of them.

Feng -- who conducted autopsies on the two bodies -- told us he was able to make the determination from the crime scene investigation, police interviews, autopsy findings and preliminary lab results -- which include a gunshot residue test.

The fact that Steve McNair's home was on the market while he was having an affair has caused speculation that he was getting a divorce ... but we just found out he and his wife were actually looking to buy another home.

We spoke to McNair's realtor, who said Steve and Mechelle were selling their massive Nashville home to buy another one "near a lake."

We're told the Nashville home was set to be sold for $2.9 million, and that Mechelle told the realtor yesterday that she wanted the sale to go ahead as planned.

McNair was found shot to death on Saturday along with Sahel Kazemi -- the woman police say he had been "dating."

A Metro Nashville Police presser was just held regarding the shooting of NFL star Steve McNair and GF Sahel Kazemi and the events leading up to their deaths.

- Kazemi was pulled over for DUI Thursday morning between 1-1:30 AM. McNair was a passenger but was allowed to leave the scene via taxi with another person. Kazemi admitted to being high.

-Thursday night, Kazemi purchased a semi-automatic pistol. Police will not say who she got the gun from.

- Early Saturday morning, McNair meets Kazemi at his Nashville condo.

- 1:30 PM Saturday, 911 call is made alerting police of the shootings. Police believe bodies were actually discovered before 1 PM -- cops are "concerned" about the time lapse.

Cops are still waiting for ballistics tests and gunshot residue reports to classify Kazemi's death.

Nashville police now think the gun recovered at the scene of Steve McNair and Sahel Kazemi's shooting death belonged to Sahel.

Police spokesmen Don Aaron said, "We believe the pistol recovered from the apartment was purchased by Kazemi."

McNair was found shot four times -- twice in the head and twice in the body -- and Kazemi suffered a single gunshot to the head. Cops were told Kazemi and McNair "had been in a dating relationship," even though McNair was married.

The gun in question was found under Kazemi's body -- cops think murder-suicide is a possibility, but nothing official yet.