MEDFORD, Ore. -- The Major Assault and Death Investigation Unit (MADIU) is investigating the death of a Jackson County Jail inmate over the weekend.

The Jackson County Sheriff's Office said that the inmate, 46-year-old Carl Sullivant, died after being taken to a local hospital in Medford on Saturday afternoon.

Sullivant was alone in a cell when he had a medical emergency, the Sheriff's Office said. Deputies initially found him unresponsive and called in medical staff. He was awake and responsive by the time he was taken to the hospital, where he later died.

The Sheriff's Office says the initial investigation revealed that Sullivant tripped and fell and his hit head.

"It is unknown if a pre-existing medical condition was present prior to the fall but he had indicated he was not feeling well and was moved from general housing to an area where medical staff could observe him more closely," the Sheriff's Office said.

Ashland Police is assisting the Major Assault Death Investigation Unit in the investigation, which is standard for in-custody deaths. An autopsy will be scheduled.

Sullivant was in jail on drug related charges.