(CNN) Another inmate has died at Mississippi State Penitentiary, the county coroner said Wednesday.

Thomas Lee

Thomas Lee, 49, was found hanging in his cell Wednesday morning in Unit 29, where some of the most violent criminals are held, said Sunflower County Coroner Heather Burton and the Mississippi Department of Corrections (DOC).

When guards found Lee in his single-person cell, they cut him down, began CPR immediately and notified medical staff, Burton said. The medical staff continued CPR for about 15 minutes, Burton said, but the inmate was pronounced dead at 10:47 a.m. (11:47 a.m. ET), Burton said.

"The cause of death appears consistent with ligature hanging but the official cause and manner of death is pending investigation" by the DOC and autopsy results, Burton said.

Lee pleaded guilty to capital murder and was sentenced to life without the possibility of parole in 2014 after a car he was a passenger in ran over a police captain, the DOC said.

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