Lisa Gores' one hope after her affair with her husband's brother was revealed was that a tape of the lovers' conversation would never become public. She may not get her wish.

On Wednesday, federal prosecutors were expected to play the recording allegedly made by private investigator Anthony Pellicano between her and her husband's sibling, Tom Gores. It's the only wiretapped call introduced into evidence at the trial of Pellicano and four co-defendants.

Prosecutors believe Pellicano, 64, bribed police officers and telephone company workers to collect information for clients to use against rivals in legal and other disputes. Pellicano and the other defendants have pleaded not guilty to various charges in the case.

Prosecutors have said there it was difficult to decrypt audio files dubbed by Pellicano and seized by FBI agents during raids on his office several years ago. They haven't revealed, however, why they will play only one at trial or whether they have additional wiretapped calls.

Lisa Gores testified Tuesday that she and Tom Gores, who also was married, had an affair in early 2001 while she was still married to her husband, billionaire businessman Alec Gores. The couple eventually divorced in August 2001.

She testified that she learned her husband had hired Pellicano to investigate her. On the recording, she said she talked to Tom Gores about her concern that someone had been following them after a rendezvous earlier in the evening at the Beverly Hills Hotel.

Just days before Lisa and Tom Gores met at the hotel, prosecutors said their names were illegally run through criminal databases by former Los Angeles police Sgt. Mark Arneson, a co-defendant in the trial.

Lisa Gores said she and Pellicano discussed the tape and she pleaded with him to destroy it so it wouldn't be made public, because "I didn't want anything out there."

"I was very nervous and scared of the tape getting out," a tearful Lisa Gores testified. She also acknowledged she lied to FBI agents during a 2003 interview about the affair, but she was never charged.

On Tuesday, hedge fund manager Adam Sender testified that Pellicano suggested film producer and one-time Nevada gubernatorial candidate Aaron Russo could be murdered over an investment dispute. Sender said he did not approve of the suggestion.

None of the charges against Pellicano or the four other defendants in the federal wiretapping case involve solicitation of murder. Russo died last year.

Acting as his own lawyer, Pellicano asked Sender if the statement could have been a passing suggestion, since Sender was spending hundreds of thousands of dollars on the lawsuit.

Sender, who was given immunity in exchange for his testimony, said it was possible.

In all, 14 people have been charged in the case, and seven already pleaded guilty to a variety of charges including perjury and conspiracy.