UKIAH — A Mendocino County jury on Monday found Billy Norbury guilty of first-degree murder and of using a firearm to kill Jamal Andrews in January.

But the case is not over. A trial begins Tuesday to determine whether Norbury was insane at the time he drove an all-terrain-vehicle to Andrews' Redwood Valley home and shot him twice with a high-powered hunting rifle. Andrews was a reggae musician.

Norbury's family members wept as the guilty verdict was read. They declined to comment.

Andrews' mother, Lucy Andrews, sighed with relief.

"I'm relieved at the verdict and thankful," she said. But she also expressed sympathy for Norbury's family.

"This is just such a huge tragedy for all of our families," she said.

Norbury, 34, stood calmly in a wide stance, his hands shoved deep into his pockets as the verdict was delivered.

Neither the prosecutor, District Attorney David Eyster, nor defense attorney, Al Kubanis, were surprised by the verdict.

"The evidence supported the verdict," Eyster said.

"We felt from the start the issue in this case really has to do with Billy Norbury's insanity," not whether he killed Andrews, Kubanis said.

Some evidence that Norbury was delusional and paranoid already was presented during the first phase of his trial.

It included the alleged motive: jealousy. Norbury had accused his estranged wife of having an affair with Andrews, according to court testimony. The two did not know each other. Norbury also did not know Andrews. They met only after Norbury began making strange, uninvited appearances at the home Andrews shared with his girlfriend and infant son. There were two such visits prior to the shooting.

Norbury also indicated he thought Andrews might have turned him in to police for growing marijuana, according to court testimony. Norbury was not under investigation for marijuana cultivation at the time, witnesses said.

According to court testimony, Norbury had become increasingly paranoid in 2011. He believed he was being watched and monitored through the TV, radio, cellphone and listening devices planted under the house. He also thought he was being watched by helicopters and airplanes, his estranged wife testified.

Norbury also sometimes suspected family members of conspiring with his phantom observers.

The insanity trial is expected to begin in the morning.

You can reach Staff Writer Glenda Anderson at 462-6473 or