MEMPHIS, Tenn. -- A man is dead after he was found unresponsive in his cell at the Shelby County Jail on Tuesday, according to the Shelby County Sheriff's Office. Reports say the detainee, identified as 29-year-old Joyner Wesley was found unresponsive in his cell by corrections officers shortly after 5:30 p.m. The SCSO says paramedics and the Memphis Fire Department took lifesaving measures and transported Wesley to Methodist Hospital in critical condition, where he was pronounced dead on arrival just after 6:30 p.m. His cause of death has not been determined, but the sheriff's office says preliminary information points to an overdose. Detectives will not be able to confirm his cause of death until information comes back from the medical examiner's office. The investigation is ongoing.