PITTSBURGH -- A Pittsburgh man is on trial for homicide, accused of killing someone at the Homestead tanning salon that he ran.

One key piece of evidence -- the body -- is missing, but that didn't prevent the trial from beginning on Monday.

Patrick Kenney, 22, of Jefferson Hills, disappeared on Feb. 1, 2005. His Cadillac Escalade was found parked on McCaslin Street in Greenfield, but the case remained cold for two years before police arrested Bryan Sedlak, 37, of Pittsburgh's Greenfield neighborhood.

At a preliminary hearing for Sedlak in 2007, a witness claimed Kenney was killed inside the former Water's Edge tanning salon in Homestead and the body was wrapped in a carpet.

In opening statements, Sedlak's attorneys said that Sedlak did kill Kenney, but did so in self-defense after Kenney tried to rob him of money and drugs. Sedlak's defense team has not said where Kenney's body is located.

On Monday, 31-year-old Scott Hoover testified that Sedlak told him he killed Kenney in the tanning salon and wanted help moving the body.

Hoover said that he did not help move the body, but did call the police about the killing either.

Richard Roscoe Jr. -- a self-proclaimed drug dealer who was granted immunity from prosecution -- told the jury much of what he said happened on Feb. 2, 2005, the day that police think Kenney died.

Roscoe testified that he sold cocaine to Kenney in the parking lot of the Baltimore House restaurant in Pleasant Hills around 3 p.m., and that Kenney was with a man named Bryan, although Roscoe could not say whether it was Bryan Sedlak.

By the time a search warrant was secured for the tanning salon, the walls had been ripped out and the floors covered with several coats of paint, police said. Still, investigators said they were able to recover a .22-caliber bullet from the premises.

Kenney's parents said that their son left home around 6:45 p.m. on Feb. 1, 2005, and told them he would be back in an hour for dinner.

He never returned, and no money was taken from his credit card or bank accounts, police said.

"Day after day, we were waiting for the front door or the garage to open," Kenney's father testified.