FORT WORTH, Texas (April 19, 2009)--The son of Texas socialite Priscilla Davis was found dead on a Fort Worth bench on a December day. His belongings were in bags, sitting on the table, but it was two months later when his family would learn of his death.

By then, Jack Wilborn Jr., 47, had been buried unceremoniously in an unmarked grave in Arlington.

The Tarrant County medical examiner's office found Wilborn died accidentally from a lethal combination of too much alcohol and too much morphine.

Medical examiner Nizam Peerwani said the staff identified his parents, but found that they were dead.

When the office could not find any other living relatives, he was buried, but Jack Wilborn Jr. had an ex-wife, a 21-year-old daughter named Amanda, and a sister, Dee Davis, who lives in Euless.

The medical examiner's office later learned Wilborn's mother gained notoriety as the wife of Cullen Davis, the millionaire oilman who was accused in a deadly shooting rampage in 1976 while the couple was divorcing.

Wilborn's sister, 12-year-old Andrea Wilborn was killed in the shooting.

Cullen Davis was acquitted in the murder of his stepdaughter, Andrea, and no one was ever convicted of the shootings.

The family learned tragedy had struck again in late February.

A counselor for an alcohol rehabilitation center called to check on his progress, but family members had not seen him.

The social worker called again later to say that a database search showed that Jack Wilborn Jr. was dead, the Fort Worth Star-Telegram reported.

Peerwani maintains that his staff followed procedures, but he has agreed to help pay to have the body exhumed and taken to a funeral home of the family's choice.