HOLTON (KSNT) – Jackson County Sheriff Tim Morse has identified the inmate who died in the Jackson County Jail.

The inmate was identified as 70-year-old Mark William Hull, of Topeka, Kansas.

Hull was found unresponsive by Jackson County jail staff shortly before 3 a.m., according to a press release by Sheriff Tim Morse. Attempts by EMS to revive the inmate were unsuccessful. He was pronounced dead at 3:40 a.m., according to officials.

Officials say conducted an autopsy Wednesday, with preliminary results indicating his manner of death was natural, likely related to heart complications. No foul play was suspected. A final autopsy is pending, according to a press release from the Kansas Bureau of Investigations (KBI).

Melissa Underwood with the KBI said even though no foul play is suspected, KBI investigators visited Jackson County Jail to investigate.