Tristan Johnson, 22, of Cary.

Police say they arrested a Cary father accused of aggressively rocking his 4-week-old baby side to side, causing serious injuries that left the child in the intensive care unit.

The Cary Police Department was contacted by the Department of Children and Family Services (DCFS) on June 23.

DCFS told police about a 4-week-old baby that was suspected to be the victim of child abuse, according to Cary Deputy Police Chief Scott Naydenoff.

The male child was taken to the emergency department of a local hospital by a parent on the evening of June 22 after the child began experiencing seizures or a similar medical event, Naydenoff said.

Medical personnel evaluated the child, who was then transferred to Advocate Lutheran General Hospital in Park Ridge.

The boy was admitted to the hospital’s pediatric intensive care unit for more advanced medical care.

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Naydenoff said investigators learned the child suffered a broken arm and brain injury.

A criminal investigation ensued into the circumstances that led to the child’s injuries.

The investigation was conducted in cooperation with the McHenry County Crimes Against Children Task Force.

The child’s father, Tristan Johnson, 22, of Cary, was identified as the suspect, Naydenoff said.

The McHenry County State’s Attorney’s Office approved two counts of aggravated battery to a child, a Class X felony.

A criminal complaint filed in McHenry County Circuit Court said the abuse occurred between June 15 and June 22.

Johnson allegedly held the baby by his torso and rocked him side to side in an aggressive manner, the complaint said. The boy’s head and neck were not supported.

The child has since been released from the hospital and care of the child is being coordinated by DCFS, Naydenoff said.

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An arrest warrant was obtained Thursday for Johnson, who was taken into custody Friday by officers in Cary.

He was transported to the McHenry County Jail and bond on the warrant was set at $500,000.

Johnson faces up to 30 years in prison if convicted of his charges. He is scheduled to appear in court on Saturday.