According to ClickOnDetroit.com, officials said Priscilla Slater, 38, was found unresponsive in a holding cell around 12:35 p.m. by Harper Woods Department of Public Safety personnel.
Slater was arrested on Tuesday after Harper Woods police said the man she was with fired 19 shots at a motel.
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According to officials, medics attempted to revive Slater but were unsuccessful.
Harper Woods officials say the Michigan State Police are investigating the incident.
Protests, including several members of Slater's family, gathered outside Harper Woods City Hall on Friday (June 12) to confront the town's mayor Ken Poynter and demand justice.