HOUSTON -

The mother of a teen charged with murder is now under arrest herself.

Deputies say Caroline Bustamante-Salas tampered with evidence.    Investigators believe her son, Jose Bustamante-Salas, killed his 39-year-old girlfriend Brandy Renger early Wednesday morning.

Police say he changed his clothes and tried to scrub the crime scene at the Park Row Apartments on Park Row Drive and Greenhouse Road before he dialed 9-1-1.

Investigators said Renger had blunt force trauma to her head, neck and upper body.

Autopsy results will determine the exact cause of death.

On Wednesday afternoon, crime scene investigators were looking at contents from inside Renger's jeep. They towed that vehicle, as well as a car that belongs to the boyfriend's family.