Authorities have no immediate plans to arrest anyone in the fatal shooting of a man at basketball star Jayson William's estate, but may file charges in the future, a prosecutor said Saturday.

Acting Hunterdon County Prosecutor Steven C. Lember would not say who prosecutors believe was the shooter. He has said Williams, his brother Vincent and about 10 guests were in the house at the time.

"I'm not prepared to state where we are in the investigation, in terms of who the shooter was," Lember said. "The fair thing to say is we have a pretty good idea of who that was, and we're trying to determine how that happened."

The prosecutor said that whether charges are filed would be his decision, and he needed to review police reports and transcripts of witness interviews, neither of which were finished Saturday.

Authorities were called to Williams' 65-acre estate early Thursday and found limousine driver Costas Christofi, 55, in a bedroom with a shotgun wound to his chest. Authorities have said the shotgun appeared to be one of several owned by Williams, a former New Jersey Nets player.

Investigators quickly ruled out suicide, and the death was classified as suspicious after a preliminary review by the medical examiner.

Christofi, 55, of Washington Borough, had been hired by Williams to take friends from a charity sporting event featuring the Harlem Globetrotters in Bethlehem, Pa., to a restaurant, and then to Williams' home, about 30 miles northwest of Trenton.

Williams' lawyer, Joseph Hayden, has characterized Christofi's death as an "unfortunate accident." Hayden said Williams was giving his guests a tour of his home when Christofi was shot.

The 40-room mansion has an indoor pool, bowling alley and movie theater, as well as a skeet-shooting range and par 3 golf hole.

Hayden could not be reached for comment Saturday; no one answered the phone at his law firm. A message left at Williams' home was not immediately returned. A message left at the office of Williams' agent, Sal DiFazio, was not returned, and no one answered at his home.

The 6-foot-10 Williams was once among the NBA's best rebounders, but leg injuries ended his basketball career. He retired in 1999 and now works for NBC Sports as an NBA studio analyst.