Oct. 14 (UPI) -- Missouri on Tuesday is scheduled to execute its first death row inmate of this year for the 2005 murder of a state highway patrol officer.

Lance Shockley, 48, is to die by lethal injection starting at 6 p.m. CST at the Eastern Reception, Diagnostic and Correctional Center in Bonne Terre, Mo.

He was convicted of murdering Sgt. Carl DeWayne Graham Jr., the Missouri State Highway Patrol officer investigating Shockley for manslaughter in connection to an earlier car crash, on March 20, 2005.

Shockley maintains his innocence.

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