BLOOMINGTON, Ill. (AP) — A Bloomington, Illinois man was sentenced to 30 years in prison after pleading guilty to murder in the death of his infant son.

The Pantagraph in Bloomington reports Ryan Howard admitted to causing the child's serious injuries in 2011 that led to the infant's death nine months later.

The now 25-year-old Howard originally pleaded guilty to aggravated battery for the injuries suffered by the infant that eventually led to the boy's death nine months later.

Assistant McLean County State's Attorney Jacob Harlow said Thursday Howard admitted he violently shook the 2-month-old baby after he became angry with the child's mother.

The state vacated the aggravated battery conviction and Howard will receive credit for the 2,517 days served on the initial charge.

The state filed the murder charges in 2016 after reopening an investigation into the case.

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Information from: The Pantagraph, http://www.pantagraph.com