Jayson Williams (search) regularly visits the grave of the limousine driver killed by his shotgun blast, and is "terrified" of going to prison for what he called an accident, the former NBA player said in an interview to be televised Friday.

"Me and my wife go every Sunday after church service. We go down every Sunday since the first week after Mr. Christofi was buried. We go down there and we pay our respects," Williams told Barbara Walters on ABC's "20/20" regarding Costas "Gus" Christofi (search).

"I will never be able to move on as much as people would like me to. You know, this is something that's, it's devastating to two families," Williams said in his first extensive public remarks since the shooting at his mansion in Alexandria Township on Feb. 14, 2002.

The broadcast will come at the end of a week in which jury selection began in the manslaughter trial of Williams, 35, who retired in 2000 as center of the New Jersey Nets (search).

Williams faces seven charges, including aggravated manslaughter and witness tampering, that could carry up to 55 years in prison. Two of his guests pleaded guilty to tampering with evidence, one for wiping down the shotgun that killed the 55-year-old Christofi and the other for hiding Williams' clothes. Both said they acted at Williams' request, and have agreed to testify against him.

Williams said he's "terrified" and never wants "to leave my family over this accident."

"I have a 13-month-old baby. I have a ... pregnant wife. I have a beautiful family. I want to be here, for my family. I want to be here for my baby. I want to see the birth of my baby," he said.

"This was an unforeseeable accident. That's all I can explain. It was just a terrible, horrible, worst-night-of-my-life accident that could ever occur."

Walters interviewed Williams and his wife, Tanya, who both declined to discuss specific events because of the impending trial.