They very likely did as per some information on the first page. Sherrod Jr had ties to Joliet, Illinois and now identified Jenifer was from there too. Their bodies were moved on top of each other after they were both shot and then both were burned with tires and trees on top of them.
From 2016 news article
Charlene's Doe remains were found with Tony Sherrod, of Pembroke Township, along Beaver Creek in Willow Slough State Park near Morocco, Ind., on Aug. 5, 1988. They had been missing since July 4 after leaving a family function in Pembroke.
Both were shot in the head and their bodies burned. McCord said they probably were killed July 4. A fisherman found the skull of Charlene and contacted authorities.
Indiana coroner vows to identify murder victims