A Mills man is now admitting his role in a March stabbing in Casper.

Thirty-year old Robert Simmons has pleaded guilty to one count of aggravated assault and one count of aggravated burglary.

According to investigators, Simmons was with Zacharia Johnson in early March, when they entered the home of Robert Masterson, and stabbed him several times.

When interviewed by police, Simmons admitted to stabbing Masterson once.

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Two days after the stabbing, Simmons crashed his car into the North Platte River in Mills.

While checking Simmons for injuries, police confiscated a knife.

Detectives were later informed by fire personnel at the hospital, that Simmons told them something to the effect that he was trying to “atone for his sins for stabbing a guy the other night,” and that was the reason he drove his car into the river.

Simmons is being held on $75,000 bond, and could receive between five-to-25 years in prison for the aggravated burglary charge, and up to 10 years on the aggravated assault charge.

He will be sentenced at a later date.

Meanwhile, Johnson has pleaded not guilty to similar charges and is awaiting trial.