He went to protect her from her boyfriend, Shane Anderson, after she called him in distress.
They found inconsistencies in his story, such as the position of Alex's body and the dry sink.
She had never shot a gun and didn't like them, making her alleged suicide unfathomable.
The door lock piece was found under Alex's head, suggesting the door was forced open before she was shot.
He was found guilty of killing Alex, despite his claims of innocence and the lack of direct evidence.
A nurse is found dead in her apartment. Surveillance video captures her coming home for the last time. Can investigators piece together what happened next? Natalie Morales reports.
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