Inside the flaming car were the bodies of two women, Mary Ann Urban-Danno, 51, and Theresa Urban, 79. Urban-Danno was Robert Danno's wife, and Urban was his mother-in-law, police said.
After the car was extinguished by the Palos Fire Protection District, an autopsy revealed that the cause of death for both women was strangulation.
Investigators believe that the two women were killed earlier on Saturday in the 5600 block of S. Neenah Avenue in Chicago's Garfield Ridge neighborhood. The bodies were then put into the PT Cruiser which belonged to Urban-Danno, police said. The car was driven out to the forest preserve and set on fire, police said.
The two men are scheduled to appear in bond court on Tuesday.