Nashville, TN -- (Sports Network) - Nashville police held a press conference Wednesday and said the death of former NFL star Steve McNair was ruled a murder-suicide.

Nashville police chief Ronal Serpas said McNair was shot while sleeping by his 20-year-old girlfriend, Sahel Kazemi, last Saturday at a Nashville condominium. There was also information that Kazemi was having financial problems and Serpas said Kazemi was "spinning out of control."

Serpas added that through interviews with friends, Kazemi suspected McNair, who was married, was having an affair with a second woman.

"While we may never know what drove Kazemi to make that decision on Saturday morning, the totality of the evidence clearly points to murder-suicide," said Serpas.

Just a day after the deaths, police at first called it a homicide, but that clearly changed Wednesday.

"McNair was seated on the sofa and was likely asleep and we believe Kazemi shot him in the right temple then shot him twice in the chest and then shot him a final time in the left temple," said Serpas. "Kazemi then positioned herself next to McNair on the sofa and shot herself once in the right temple."

Serpas added that the five shell casings recovered matched the weapon purchased by Kazemi last Thursday. The five bullets recovered were all fired from the weapon at the scene.

"Because there's a lack of any evidence of a struggle or defensive wounds to McNair, his physical position on the sofa, the trajectory of the bullets in the wound pattern, we still believe Kazemi shot Mr. McNair and he didn't know," added Serpas.

McNair, who announced his retirement from the NFL in April 2008, last played in the NFL in 2007, when he was with the Ravens. The longtime Titans quarterback spent 13 seasons in the NFL, 11 with the Houston Oilers/Tennessee Titans franchise.