A Los Angeles county sheriff’s deputy shot and killed a 27-year-old woman who had called 911 to report that she was under attack by a former boyfriend, police officials and lawyers for the victim’s family said on Thursday. Records show the deputy had killed another person in similar circumstances three years ago.

On 4 December, Niani Finlayson called police and “reported that her boyfriend would not leave her alone and then screaming and sounds of a struggle could be heard”, the LA sheriff’s department (LASD) said in a statement. When deputies arrived at the apartment in Lancaster, a city in the northern region of LA county, they could hear screaming, LASD said.

Finlayson was inside with her nine-year-old daughter and had been injured by her ex-boyfriend and wanted him removed, her family’s attorneys said. The exact circumstances that led to the fatal shooting are unclear and LASD has so far declined to release body-camera footage.