Teenager shot in head while in car in Houston's Greenspoint area.

A 17-year-old boy was shot in the back of the head while driving in a Greenspoint-area neighborhood in Houston. The victim's car rolled and hit a parked car after the shooting. He was transported to a local hospital and is in critical condition. Investigators found marijuana inside the victim's backpack, raising questions about whether the shooting was drug-related. Police are searching for surveillance video or witnesses to identify the suspect.