Michael Yakubec was arrested late Saturday, hours after the Cook County Medical Examiner's Office ruled his father's death a homicide.
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On Thursday, Yakubec's father, John Yakubec, was taken via ambulance to St. Mary Medical Center in Hobart with head injuries. His son said he had fallen in the shower, but police said the elderly man was fully clothed and dry when he came to the hospital and his injuries were not consistent with a fall.
The elder Yakubec was flown by helicopter to Stroger Hospital in Chicago for further treatment, but pronounced dead at 11 p.m. Thursday.
When authorities questioned Michael Yakubec, he said he had left the house between 2 and 2:30 p.m. and that he found his father unconscious in the shower when he returned.
Authorities said Yakubec told them after he left St. Mary Medical Center he drove to Chicago, but couldn't find Stroger Hospital using the directions given to him.
Hobart police confirmed with Stroger officials that Yakubec never showed up there.
On Saturday, police searched the home in the 6100 block of Oregon Street and found blood in the bathroom and two rifles in the younger Yakubec's bedroom.
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At 10 p.m. Saturday evening, a police officer noticed Yakubec's black Ford Mustang in the area near his home. A K-9 team tracked him back to his home, where he had locked himself in a room. He was taken into custody.