Authorities say a pregnant Los Angeles woman has been raped and stabbed to death by a former mental patient.

The Los Angeles County district attorney's office says 22-year-old Boneetio Washington was charged Thursday with three counts of murder in the death of 39-year-old Eun Kang and her unborn twins. The Culver City man also is charged with rape and is jailed without bail.

Prosecutors haven't decided whether to seek the death penalty. They did not know whether he had retained an attorney.

Police say Washington randomly targeted Kang, who was four months pregnant, in her Venice home Tuesday.

Washington is on probation after pleading no contest to burglary in September. Court records show that case was delayed after he was declared mentally unfit and spent several months in a state mental hospital.