On February 12, 2008, in the computer lab at E.O. Green Junior High School, a tragedy unfolded.

14-year-old Brandon McInerney shot his 15-year-old classmate, Larry King, twice in the back of the head at point-blank range. Two days later, on Valentine's Day, King succumbed to his injuries.

McInerney pleaded guilty to second degree murder and voluntary manslaughter and was sentenced to 21 years in prison.

The case may be closed, but the tragedy leaves many questions behind. Questions raised in the new documentary "Valentine Road," which airs tonight at 9 p.m. on HBO. Filmmaker Marta Cunningham joins Take Two to talk about the film and the shocking murder.