A prolific serial killer, that was already on death row for the murder of 10 women in Los Angeles, has been convicted of four more killings.

Chester Turner, 47, was convicted on Thursday of strangling four women in South Los Angeles between 1987 and 1998 after DNA evidence linked him to the crimes.

He had already been convicted in 2007 of strangling 10 women to death, as well as the murder of one of the women’s unborn child, after being identified through California’s CODIS (Combined DNA Index System) database, and sentenced to death.