A 46-year-old inmate at the Delaware County Jail was found dead early Friday morning.

Corrections officers found Edward Michael Sullivan, of Ashley, Ohio, at 3:30 a.m. lying on the floor, unresponsive, according to Delaware County Sheriff Russell Martin.

Officials immediately began lifesaving efforts, but Sullivan was pronounced dead by medics at 4:06 a.m., Martin said.

The cause of death is unknown.

Foul play is not suspected at this time, Martin said.

Sullivan was booked into the Delaware County Jail on Wednesday.

“We are deeply saddened by his death and our hearts and prayers go out to Sullivan’s family,” said Sheriff Martin. “Per our policy, the death is being investigated. We anticipate autopsy results will provide additional insight into the gentleman’s passing.”