WICHITA– A Sedgwick County inmate was found unresponsive in his cell at about 7:40 a.m. Monday.

Authorities reported in a media release that following immediate medical attention from on-site staff, the 55-year-old man was transported to a Wichita hospital.

After additional medical aid was administered, he was pronounced dead at around 9:40 a.m. The cause of death has not been determined.

The Kansas Bureau of Investigation and the Sedgwick County Sheriff’s Investigation Division were notified.

The inmate’s identity is being withheld pending notification of his family, however, officials say he was booked into the Sedgwick County Detention Facility on Dec. 8, 2014, on felony charges.

This is the third in-custody death in that detention facility this year.

The first was that of an elderly inmate who battled terminal illness for several weeks prior to his death on Jan. 21.

The second was that of a 25-year-old man who was being treated for a medical issue prior to his death on Feb. 22.