MARTINEZ -- After less than three hours of deliberations, a Contra Costa County jury on Thursday convicted a Benicia man of first-degree murder in the 2009 slaying of 18-year-old Martinez resident Eric Bean.

The jury also found Timothy "Timmy" Delosreyes III guilty of torture, residential burglary and grand theft of firearms. Delosreyes is expected to be sentenced Oct. 19 to 25 years to life in state prison. His attorney had argued for a voluntary manslaughter verdict.

A passer-by discovered Bean's badly beaten body on the side of rural McEwen Road in unincorporated Martinez on Dec. 21, 2009. He was killed the day before in a Benicia house by Delosreyes, his father and a married couple because the group, high on methamphetamine, feared Bean was going to implicate them in the theft of his father's guns, deputy district attorney Jason Peck said.

Bean was held captive, hogtied in a bedroom and beaten for hours before he died of blunt force head trauma and strangulation, Peck said. There was testimony that Delosreyes, who was a childhood friend of the victim, put a knife in Bean's mouth and stepped on it. At one point during Bean's long ordeal, his torturers took a break to eat sandwiches.

The defendant's father, 38-year-old Timothy Delosreyes Jr., testified against his son at the trial in exchange for the promise of a 16-year prison sentence. Jurors in March convicted 35-year-old Robert Gardner, whose house is where the killing occurred, of first-degree murder, torture and grand theft. Gardner is serving a 29-years-to-life state prison sentence.

Another co-defendant, Gardner's wife, Melody Rives, 32, testified against all the male defendants in hopes that the District Attorney's Office will dismiss her murder charge and allow her to plead to being an accessory.

Contact Malaika Fraley at 925-234-1684. Follow her at Twitter.com/malaikafraley.