McNair Mistress' DUI Arrest Caught on Tape

Sahel Kazemi, 20-year-old alleged mistress of Steve McNair, was arrested on a DUI just two days before committing the murder-suicide -- and the tape's been leaked to the Internet.

Kazemi was given a sobriety test after being pulled over in the Cadillac Escalade that McNair reportedly gave her as a birthday gift. She was arrested and charged with DUI. Hours later, Sahel would purchase a gun for $100 that she used to end both of their lives.

Police reveal that Kazemi suspected McNair of having an affair with yet another woman -- an alleged mystery woman -- and that was her motive for the killing.

A closed-casket wake and funeral will take place today for the former NFL superstar, who leaves a wife and four sons.