CHICAGO (CBS)–The bodies of Bradley University professor Susan Brill De Ramirez and her husband, Antonio Ramirez Barron, were found near the Spoon River Bridge in Henry County, Ill., authorities said.

Prosecutors said the couple’s son, Jose Ramirez, 21, allegedly told investigators he killed his parents, and threw their bodies off a bridge.

susan brill de ramirez and antonio ramirez barron Bodies Of Peoria Couple Allegedly Killed By Son Found Near River

Susan Brill De Ramirez and Antonio Ramirez Barron, both 63, are missing and presumed dead. (Credit: Bradley University)

Ramirez, now charged with two accounts of first-degree murder, allegedly told authorities he killed his parents because he was “sick of them.”

jose ramirez Bodies Of Peoria Couple Allegedly Killed By Son Found Near River

Jose Ramirez, 21, is charged with first-degree murder in the deaths of his parents, Susan Brill De Ramirez and Antonio Ramirez Barron. (Credit: Peoria County Jail)

Another man, 20-year-old Matthew Roberts, has been charged obstruction of justice and concealment of a homicide.

matthew roberts Bodies Of Peoria Couple Allegedly Killed By Son Found Near River

Matthew Roberts, 20, is charged with obstruction of justice and concealment of a homicide in the deaths of Susan Brill De Ramirez and Antonio Ramirez Barron, both 63. (Credit: Peoria County Jail)

The police were called to the couple’s home Sunday night for a report of a burglary. When officers arrived, they found blood in the home.

Prosecutors allege Ramirez waited until his parents were asleep, and then sprayed them with pepper spray before stabbing them to death and dumping their bodies near the river.