A death row inmate in Missouri is set to be executed Tuesday after the state's governor denied his clemency petition.

Lance Shockley, 48, was convicted of first-degree murder for fatally shooting a Missouri state trooper in 2005, court records show. Shockley has maintained his innocence for the last 20 years, as his lawyers argued in multiple rounds of appeals that their client did not receive a fair trial or sentencing, claims that the state repeatedly refuted.

Missouri Gov. Mike Kehoe on Monday announced his decision to reject Shockley's plea to stay the execution, allowing the corrections department to proceed as planned with his lethal injection at the state prison in Bonne Terre.

"Mr. Shockley has received every legal protection afforded to him under the Missouri and United State

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