Antoine Walker, Jason Williams and James Posey could soon be coming to the Miami Heat in a proposed five-team trade that was nearing completion Tuesday, according to a lawyer and league official both familiar with terms of the complicated deal.

"Unless something strange happens, it's going to happen," said the lawyer, who spoke on condition of anonymity.

Miami -- which signed Shaquille O'Neal to a $100 million, five-year deal earlier Tuesday -- would obtain Walker in a sign-and-trade from the Boston Celtics, then add Williams, Posey and rookie Andre Emmett from the Memphis Grizzlies in exchange for veteran swingman Eddie Jones.

The trade -- which has been submitted to the league for approval -- was first reported by The Miami Herald. League and team officials generally do not openly discuss proposed trades until they become finalized.

Walker, Williams and Jones are the headliners in the proposed deal, one that also includes the aftereffects of a three-team deal agreed to earlier Tuesday by Sacramento, Memphis and Utah.

As part of the Walker deal, Boston would obtain Qyntel Woods, the rights to Spanish center Albert Miralles and the Heat's $1.9 million trade exception.

Walker, a three-time All-Star who averaged 19.1 points and nine rebounds last season for the Atlanta Hawks and Boston Celtics, would be a welcome addition to the Heat, said forward Udonis Haslem -- who formally signed his $30.7 million, five-year deal Tuesday.

"We're two different players and we can bring two different things to the table," Haslem said. "If we put that together, we should have a pretty good tandem."

The Celtics would get Borchardt from Memphis; Borchardt was part of Tuesday's earlier trade in which Sacramento acquired guard Bonzi Wells from Memphis for guard Bobby Jackson and center Greg Ostertag.

Memphis was then expected to send Ostertag to the Utah Jazz for guard Raul Lopez, forward Kirk Snyder and Borchardt. Snyder would be sent to New Orleans, along with the Heat's Rasual Butler, and Borchardt would head to Boston.

Jones, a career 16.4-point-per-game scorer, averaged 12.7 in the regular season and 13.7 in the playoffs as Miami's third option. Williams averaged 10.1 points and 5.6 assists for the Grizzlies last season.

"He's one of the best playmakers in the game," Haslem said of Williams.

Posey was limited to 50 games this past season because of injuries, and only 18 starts. He averaged 8.1 points and 4.4 rebounds.