A teenager accused of killing a prominent attorney's wife pleaded not guilty to murder Wednesday.

Scott Dyleski, 17, who appeared briefly in Contra Costa County Superior Court, is accused of killing his neighbor, Pamela Vitale.

Vitale, wife of defense attorney and television commentator Daniel Horowitz, was found dead Oct. 15 in a mobile home at the Lafayette hilltop estate where the couple was building a home.

Investigators think Dyleski got into a fight with the 52-year-old woman after going to her home to look for marijuana-growing equipment he had ordered with a stolen credit card.

Dyleski's mother, Esther Fielding, was accused of helping her son destroy evidence, but the charge was dropped after she agreed to cooperate with prosecutors.

Dyleski, who was being held on $1 million bail, is due back in court Dec. 8. Lawyers are forbidden from talking about the case under the terms of a gag order; a hearing on that order was scheduled for Nov. 16.