A 54-year-old Sturgeon Bay man died Thursday night while in custody at the Door County Jail, the Door County Sheriff’s Office said Friday.

Jail deputies found the man unresponsive, not breathing and without a pulse at 11:12 p.m. and began life-saving measures, according to a Sheriff’s Office press release.

“Paramedics from the Door County Emergency Services, first responders from the Sturgeon Bay Fire Department and officers from the Sturgeon Bay Police Department and Door County Sheriff’s Office- Patrol Division responded to the jail,” the press release reads. “Lifesaving measures continued but were not successful and the subject was pronounced deceased.”

The man’s name will not be released until his next-of-kin has been notified, Sheriff’s Office Chief Deputy Patrick McCarty said Friday.

The man had been in custody for about a day and a half on a probation hold, McCarty said. McCarty said he could not answer any questions about whether the man had any medical conditions, citing privacy concerns.

The Door County Sheriff’s Office asked the Brown County Sheriff’s Office to conduct a death investigation, McCarty said, in an effort to be as open and transparent as possible. The Brown County Sheriff’s Office has agreed, and the Door County Sheriff’s Office has turned over all its related records, McCarty added.

The Brown County Medical Examiner has an autopsy scheduled for Monday, according to the press release.

The Sheriff’s Office’s call log for Thursday shows a call to the jail’s address for a heart problem at 11:14 p.m., and a second call for a death investigation at 11:52 p.m. McCarty said the second call was added in error when personnel at the Sheriff’s Office’s communications center intended to update the description of the first call.