San Diego police officer and daughter found dead at their home

The victims of a fatal knife attack in their home in the Rancho Penasquitos neighborhood in San Diego have been identified as a veteran San Diego police officer and her daughter.

Donna Williams, 52, a detective, and her daughter, Breanna, 18, a recent high school graduate, were found in their home when police arrived early Monday morning in response to a neighbor's call about a woman screaming for help.

Williams' son, Brian, 24, was arrested on suspicion of killing his mother and sister. He was sitting on the front lawn, near his sister's naked body.

Donna Williams was the widow of San Diego police officer Howard Williams, who died in 2007. She was a 31-year veteran of the force.

ALSO:

Post-Carmageddon crashes snarl L.A. freeways

Mystery surrounds deaths at Spreckels Mansion

Record marijuana plant seizure reported by authorities

--Tony Perry in San Diego

Photo: Donna Williams. Credit: San Diego Police Department