ALBUQUERQUE, N.M. -- Family members of three people slain by a teenage boy on Sam Donaldson's New Mexico ranch filed a lawsuit on Monday claiming the video game "Grand Theft Auto: Vice City" contributed to the shootings.

The $600 million suit filed in Albquerque names several companies and Cody Posey, the teen who was convicted in the July 2004 deaths.

Posey admitted to shooting and killing his father, Delbert Paul Posey, and stepmother, Tyrone Posey, along with a stepsister in 2004. He was sentenced earlier this year to state custody until he is 21.

During the trial, prosecutors described Posey as a ruthless killer. But defense lawyers claimed the teen was subject to years of abuse by his father, and that the killings were committed in self-defense.

But the wrongful death suit blames "Grand Theft Auto: Vice City," claiming that Posey played it "obsessively" for several months before the killings.

According to the suit, plaintiffs' lawyer Jack Thompson was told by a sheriff's deputy that the game and a Sony Playstation 2 were found at the ranch.

The suit filed is against Posey himself, Sony Corporation of America, Take-Two Interactive Software and Rockstar Games.

Paul Posey's brother Verlin hopes the suit will save lives.

"If doing this can stop one person killing or one family going through the hell we've been through, then it's worth it," Verlin Posey said.

Albuquerque TV station KOAT left a message with Sony Entertainment regarding the case, but has yet to hear back from the company.