A 24-year-old man is accused of bludgeoning his parents to death, stashing their bodies in the backyard cesspool and using their credit cards for a big-ticket spending spree, authorities said Friday.

James A. Soares Jr. faces 68 counts of murder, computer fraud, obtaining money under false pretenses and fraudulent use of a credit card. He pleaded not guilty Friday at an arraignment.

Investigators allege Soares bludgeoned James and Marian Soares with a hoe, then dragged their bodies to the in-ground cesspool behind their home in Warren, a small town about 13 miles southeast of Providence.

The couple was reported missing July 15 after they failed to attend a family reunion. State police dug up their remains with a backhoe nearly two weeks later.

The son's lawyer, John Lovoy, did not return a call seeking comment. Soares remains held at the state prison in Cranston without bail, where he has been since his arrest in July.

James Soares' 20-year-old girlfriend, Nicole Pacheco, is charged with participating in the shopping spree that included a television, computer and other electronics. A judge entered a not guilty plea on her behalf Friday at her arraignment, where she was not represented by a lawyer.

Pacheco was ordered held on $100,000 surety bail.

Pacheco is not alleged to have any role in the killings, and Attorney General Patrick Lynch said there was no evidence she knew what had happened to the couple.

Lynch did not reveal a motive for the killings.

The two allegedly spent thousands of dollars on home merchandise, including a television, laptop computer and other electronic equipment.