SANTA ANA (AP) — A former Marine accused of murder in the deaths of four homeless men, a woman and her son has died at a hospital after falling ill in his jail cell.

Orange County sheriff’s Lt. Jeff Hallock says deputies found 25-year-old Itzcoatl Ocampo in his single-man cell Wednesday and he was taken to a hospital. He was pronounced dead at about 1:30 p.m. Thursday.

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No cause of death was immediately given and an autopsy will be performed in the coming days.

Orange County prosecutors were seeking the death penalty against Ocampo for the slayings of four homeless men between late 2011 and early 2012 in what they called a serial thrill-kill spree.

He also was facing murder charges in the deaths of a school friend’s mother and brother in October 2011.

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