KLAMATH FALLS, Ore. -- A judge found a 19-year-old man guilty of murdering a California teenager who was staying at a downtown Klamath Falls motel with his mother.

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Patrick Morris, who killed Diego Aguilar, 15, of Lancaster, Calif., almost one year ago, was sentenced to life in prison.

"Now you're going to suffer the consequences," said Klamath County Judge Marci Adkisson, who deliberated for about 30 minutes before announcing her verdict Thursday. Morris could get parole after 25 years.

During the three-day trial, prosecutors said Morris shot Aguilar once, then chased him and shot him several more times. He then spit on the body, saying, "That's what you get."

"That's as close to an execution-style killing that I ever hope to see in Klamath Falls," said Deputy District Attorney Mark Costello. "He shoots down Diego like he's shooting down an animal."

Defense attorney Robert Abel said violent video games, a history of emotional and behavior disorders and the use of mind-altering mushrooms affected his client. Morris, he said, had a diminished mental capacity, couldn't understand the consequences of his actions and should have been convicted of manslaughter, not murder.

When he took the stand Thursday, Morris told the judge his account of the shooting. He said he heard his friends had planned a fight after a man staying at the motel -- someone who befriended Diego Aguilar -- flashed a gun at one of them. He didn't know what would happen that night, so he took the 12-gauge shotgun his best friend, Steven Vannarath, gave him.

Morris told the court he couldn't remember the actual shooting because "it happened so fast."

Before Morris took the stand, his mother, Irma Espitia, told the judge her story about a troubled son, whom she tried to reach out to over and over. "He would just go into his room and play those video games," she said.

The prosecution's expert witness, Dr. Michael Knapp of Ashland, said it was ridiculous to blame video games. Moreover, he said, while you usually can't predict violent behavior, other risk factors in Morris' life, such as his drug use and his emotional disorders, were stronger factors.

Prosecutors said Morris' violent tendencies had been emerging in recent years, including an incident in which he took a machete to Mazama High School to threaten another teen. On another occasion, they said, Morris told Vannarath he wanted to shoot somebody.

"He made good on it," Costello told the judge. "He finally made good on it."