In McDonald's garage, police uncovered guitar wire similar to the bloodstained wire retrieved from near the body. Police said they believe that Giraldo died before midnight, and MacPherson's mother saw her son and Davis vacuuming MacPherson's car a few hours later. Margaret MacPherson said the cleaning was not unusual, and defense attorney Matsuk argued that cleaning cars is a male teen-age obsession.
Defense attorney Ed George, who represents MacPherson, concentrated on motive, saying it was illogical to believe that MacPherson "would kill his best friend."
While attacking Lamb's case, the defense tried to mount its own prosecution of the Ace of Spades. They called Giraldo a member of the gang--a charge denied by Giraldo's family--and said the prosecution's witness also belonged to the group.
Defense attorneys said members of the Ace of Spades beat up Giraldo twice in late December, allegedly for cooperating with police in the investigation of car burglaries involving the gang.
Prosecutor Lamb successfully fought to exclude most evidence about the Ace of Spades, arguing that details about the the group were irrelevant unless the defense could produce evidence of the gang's involvement.
The jury begins deliberations Monday. The defendants face a maximum sentence of 25 years to life in prison.