NASHVILLE, Tenn. – 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 be...

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