Peoria County Coroner Jamie Harwood said a Bradley University professor and her husband fought back against their attackers.
Harwood said Susan Brill de Ramirez and Antonio Ramirez Barron of Princeville had multiple defensive wounds on their arms.
“They bluntly did not go down without a fight,” Harwood said.
They died from multiple blunt force trauma and stab wounds, Harwood said. Officials believe the attack happened late Thursday or early Friday.
The couple was last seen at work at Bradley University on Thursday. The couple’s son, Jose Ramirez, 21, was charged Tuesday with two counts of first-degree murder in connection with their deaths. Bond was set at $3 million.
Murder charges were also filed against Matthew Roberts, 20, also of Princeville. Roberts was originally charged with concealment of a homicidal death and obstruction of justice. Peoria County Sheriff Brian Asbell said a confession from Roberts was responsible for the additional murder charges.
The bodies of the couple were found wrapped in a tent and tarp in the Spoon River, north of Laura in northwest Peoria County on Tuesday afternoon.
Asbell said law enforcement officials are still interviewing associates of Ramirez and Roberts in search of a motive. Ramirez allegedly stole Barron’s vehicle, a TV and credit cards from their rural Princeville home.