Annette Martinez, 21

Annette Martinez, a 21-year-old Latina, was stabbed to death Sunday, Aug. 16, in the 1900 block of Batson Avenue in Rowland Heights, according to authorities.

Los Angeles County Sheriff’s Department deputies received a call about an assault about 2 a.m. When they arrived they found Martinez, who had a stab wound, lying in the doorway of an apartment, according to a department news release. 

Martinez was visiting the apartment with her boyfriend and their two small children, a common occurrance, said Sgt. Tim Cain.

That night, an argument broke out between Martinez and her boyfriend's sister, Lisette Kimberly Moreno, who lived in the apartment. According to Cain, Moreno stabbed Martinez in the neck and then fled. 

While waiting for paramedics, Martinez collapsed. She was taken to St. Jude's Medical Center in Fullerton, where she was pronounced dead at 3:21 a.m., according to Orange County coroner records. 

Deputies found Moreno, a 19-year-old Latina, in the apartment complex a short time after the stabbing. She was arrested on suspicion of murder and is being held in lieu of $1 million bail.

Moreno was charged with one count of murder on Aug. 18, accused of stabbing Martinez with a pair of scissors, according to a news release from the Los Angeles County district attorney's office.  She is scheduled to be arraigned Sept. 17 at Los Angeles County Superior Court in Pomona.

Cain said detectives are still investigating what happened before the stabbing. Anyone with information is asked to call the Sheriff’s Department Homicide Bureau at (323) 890-5500. Those wishing to remain anonymous can call Crime Stoppers at (800) 222-8477.