Police in Nashville are confirming that ex-NFL star Steve McNair's 20-year-old girlfriend killed him before turning the gun on herself.

They say they may never know what was going through Sahel Kazemi's mind when she shot McNair in his condominium, but they say it's clear it was a murder-suicide.

Police earlier had labeled McNair's death a homicide, but awaited further tests and investigation before saying for sure what happened.

They believe he was asleep on a sofa when Kazemi shot him in the head. She then apparently shot him twice in the chest before shooting him again in the head and then shooting herself.

McNair, a quarterback for the Tennessee Titans most of his career, was shot at a condo he rented with another man. The gun was found underneath Kazemi.