A D.C. man was sentenced Friday to spend 50 years behind bars for killing a 21-month-old boy in 2008.

The man, Jonathan Austin, 35, was on parole for scalding a 6-month-old girl at the time of the murder, authorities said.

Austin went to trial in November for killing 21-month-old Ronjai Butler, who died from blunt force trauma to the head on Nov. 16, 2008.

The jury convicted Austin on charges of first degree felony murder with aggravating circumstances and first degree child cruelty for Ronjai’s death.

Austin claimed that Ronjai was chronically ill and died of natural causes, authorities said.

Austin was caring for Ronjai at the time of the boy’s death. The boy’s mother, Austin’s girlfriend at the time, had gone to the grocery store.

At the time of the slaying, Austin was on parole after being convicted of first degree cruelty and aggravated assault charges for scalding a 6-month-old girl. Austin was in a relationship with the girl’s mother at the time of that incident.

One condition of his parole was that he have no contact with children