© Cook County Sheriff's Dept via APJohn Granat, 17, of Palos Park, Ill., was charged with first-degree murder in the deaths of his parents.
A high school student in suburban Chicago has been charged with killing his parents, who were found beaten in their home on Sunday morning.

John Granat, 17, was charged with two counts of first-degree murder in connection with the beating deaths of his parents, Cook County Sheriff Thomas J. Dart said Tuesday.

The Cook County medical examiner on Monday ruled that 42-year-old Maria Granat and 44-year-old John Granat died after suffering multiple blunt force injuries. Maria Granat was also stabbed. They were pronounced dead early Sunday in their southwest suburban Chicago home.

Early Sunday morning, Granat called 911, bringing police to the family home, the Chicago Tribune reported. He's scheduled to appear in court Tuesday morning.

"I feel like I just lost a family member," neighbor Linda Falkenburg told the Tribune. "I can't imagine why anyone would do something like this."

The couple had lived in the neighborhood for a long time and there never seemed to be any issues, neighbors told NBC Chicago.

Police haven't revealed a motive for the killings.