Officers were dispatched to assist Long Beach fire officials with the woman found in the 1100 block of Locust Avenue shortly before 1 p.m. Saturday, Long Beach police said.
Arriving officers found the victim, identified as Margarita Valdez Castro, who sustained a stab wound to the torso.
Luis Antonio Jimenez Molina, a Long Beach resident, was booked for murder and held in the Long Beach City Jail with bail set at $2 million.
Police said the crime did not appear to be random, but a motive for the stabbing was unknown.
The investigation was ongoing, according to Long Beach police.
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Anyone with information regarding the incident was urged to contact Long Beach Police Homicide Detectives Todd Johnson and Shea Robertson at (562) 570-7244. Anyone wishing to remain anonymous may call 1-800-222-TIPS (8477), or text TIPLA plus your tip to 274637 (CRIMES).