Illinois teen charged in parents' beating deaths

By the Associated Press | September 13, 2011 | 2:20 PM EDT

This undated photo provided Sept. 13, 2011 by the Cook County Sheriff's Department, shows 17-year-old John Granat, of Palos Park, Ill. Granat was charged with first-degree murder in the deaths of his parents, 42-year-old Maria Granat and 44-year-old John Granat, who were found beaten to death at their home Sunday, Sept. 11, 2011, in Palos Park. (AP Photo/Cook County Sheriff's Department)

BRIDGEVIEW, Ill. (AP) — Authorities say they arrested the teenage son of a Chicago couple found dead in their home after figuring out he lied about his whereabouts the night they were killed.

Seventeen-year-old John Granat is facing first-degree murder charges in the deaths of his parents. He was denied bond Tuesday.

Cook County Sheriff Tom Dart says Granat told investigators he was home all night. But they later determined he'd been pulled over by police two hours before he called 911 to report finding his parents dead early Sunday in their Palos Park home.

The county medical examiner says 42-year-old Maria Granat and 44-year-old John Granat died after suffering multiple blunt force injuries.

Police haven't revealed a motive for the killings but say the teen had made past death threats against his parents.