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The only stumbling block seems to be an apparent lack of an obvious motive. Says the Associated Press:
Tennessee's state medical examiner said Tuesday that investigators have been hesitant to conclude that Steve McNair's girlfriend killed the NFL star and herself because she didn't appear to have a motive, but that murder-suicide is the most likely scenario.
After the couple was discovered shot to death on Saturday, police were quick to label McNair's death a homicide. He had been shot twice in the head and twice in the chest, while 20-year-old Sahel Kazemi was dead from a single gunshot to the head. Under her body was a gun she had purchased less than two days before the killings.
Investigators were waiting on ballistics tests on the weapon before issuing a ruling on Kazemi's death, which medical examiner Bruce Levy said could come in the next few days. Kazemi's gun purchase, which was revealed on Monday, is a strong indication that she was responsible, he said.
"If we had known on Sunday about the gun I think we would have been very comfortable in ruling murder-suicide," he said. "I'll be very surprised now if they rule it isn't."