Police say the gun found at the scene where former NFL star Steve McNair died was bought by his girlfriend less than two days before the two were shot to death.

Nashville police spokesman Don Aaron said Monday that 20-year-old Sahel Kazemi bought the semiautomatic handgun Thursday evening from a person he didn't name.

An autopsy showed that McNair, 36, and Kazemi died early Saturday. He was shot four times and his death has been ruled a homicide. She was shot once and Aaron said police are still waiting for ballistic and gunpowder residue tests before deciding if she was slain or committed suicide. Their bodies were found in a Nashville condominium leased by McNair.

Aaron said that as far as he knows, McNair was not with Kazemi when she got the gun.