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WILMINGTON, Del. (CBS) — An inmate who was awaiting sentencing for his involvement in a deadly prison riot that resulted in the death of a guard has passed away, the Delaware Department of Correction announced.

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Thirty-year-old Kelly Gibbs was pronounced dead at 2:45 a.m. Thursday. Foul play is not suspected, officials say.

Gibbs was serving a 24-year, nine-month sentence for Murder Second Degree, Possession of a Firearm during the Commission of a Felony, Assault Second Degree, and Promoting Prison Contraband.

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Earlier in the week, he pleaded guilty to charges of Riot, Kidnapping and Conspiracy in relation to a riot at James T. Vaughn Correctional Center in Smyrna last February. Lt. Steven Floyd was killed during the riot. Gibbs’s sentencing was pending.

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Gibbs was being housed at the Howard R. Young Correctional Facility in Wilmington.