Accused accomplice in David Dorn murder gets probation after testimony

ST. LOUIS – A key witness whose testimony led to a conviction for a man accused of killing retired St. Louis Captain David Dorn in June 2020 had his own charges in the crime suspended in favor of probation.

The very next day, prosecutors with the St. Louis Circuit Attorney’s Office and a city judge agreed to commute the sentence for Mark Jackson, who testified against Cannon during the three-day trial.

Jackson pleaded guilty on Thursday to first-degree robbery and first-degree burglary and received a 15-year suspended execution of sentence, with five years of probation. He was credited with time served and released.

“I think the sentence is fair and just. I hope he can turn his life around, like he says he wants to,” Ann Dorn, Capt. Dorn’s widow, said in court Thursday.

Jackson had also been charged with second-degree murder, stealing $750 or more, and three counts of armed criminal action. The state dropped those charges.

David Dorn died on June 2, 2020, while responding to a burglar alarm at a friend’s business, Lee’s Pawn and Jewelry. Looters broke into the store around 2 a.m. and Dorn was fatally wounded when he confronted them. He was 77.

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