A 48-year-old man was found unresponsive in his cell at the King County Jail in downtown Seattle on Sunday morning and later died at Harborview Medical Center, according to the Department of Adult and Juvenile Detention.

The King County Medical Examiner’s Office on Monday identified the man as Dustin Rand and said his cause and manner of death are pending the results of toxicology tests.

Rand, who had previously been trespassed from the downtown Target store on Second Avenue, was booked into the King County Jail in June and charged with third-degree assault, accused of putting a Seattle police officer in a chokehold and biting the finger of a second officer when they responded to the store to enforce the trespass order, jail and court records show.

The Department of Adult and Juvenile Detention is working with Public Heath – Seattle & King County to conduct an internal investigation, according to a Monday news release. The Seattle Police Department will also conduct its own investigation into the man’s death, the release says.