He was caught in bed with a 16-year-old girl. He then murdered her and her family.

A 19-year-old man will spend decades behind bars after killing a family when he was caught in bed with one of the victims.

Marucio Johnson pleaded guilty to three counts of first-degree murder and admitted three special allegations of the use of firearm causing death, according to the Humboldt County District Attorney’s Office.

The guilty pleas were part of a deal that calls for Johnson to spend 150 years to life behind bars, but he will be parole eligible after 25 years. He entered his pleas this week in a California court.

On Feb. 9, Johnson was at a home of Nikki Metcalf, Margaret Moon and a 16-year-old. Moon was the 16-year-old’s mom and Metcalf was her stepdad.

Johnson was there with other teens for a party, according to the Mercury News.

When people went to sleep, Metcalf found Johnson and the 16-year-old in the teen’s bedroom, according to prosecutors. A struggle between Johnson and Metcalf ensued and Johnson shot the stepdad.

Johnson then shot Moon and the teen. The Mercury News reported Johnson shot the teen so there wouldn’t be witnesses to his crime.

Prosecutors admitted that victims of the crime differed on whether the state should agree to the plea deal that would allow Johnson the chance of parole. Under California law, all youthful offenders are eligible for parole unless they are sentenced to life in prison without parole.

The district attorney’s office said it attends all parole hearings for murders to make sure the board understands the significance of the crime.