SAN FERNANDO, Calif.—A 38-year-old woman was shot to death inside a house in San Fernando, authorities said July 16.

Stephanie Rodriguez was a San Fernando resident, according to the medical examiner’s office.

The shooting was reported at 3:18 a.m. Friday in the 1300 block of Kewen Street, according to Los Angeles County Sheriff’s Lt. Daniel Vizcarra. Ms. Rodriguez died at the scene.

Homicide detectives later detained 34-year-old Evelyn Torres of Palmdale as a person of interest in the killing, Mr. Vizcarra said. Ms. Torres was later officially arrested as a suspect in the murder.

A motive for the shooting was not released by the sheriff’s department, nor was the nature of Ms. Torres’s relationship with the victim.

Anyone with information on the killing was asked to call the sheriff’s department’s Homicide Bureau at 323-890-5500. Tipsters can also call Crime Stoppers at 800-222-8477.