DOWNEY -- The three suspects accused of murdering Downey police officer Ricky Galvez pleaded not guilty last week.
Jeremy Anthony Alvarez, 21, Steven Knott, 18, and Abel Diaz, 17, entered their pleas last Thursday at Norwalk Superior Court.
If convicted, Alvarez and Knott could face the death penalty, while the maximum penalty for Diaz is life in prison.
Galvez, 29, was shot and killed Nov. 18 while sitting inside his personal vehicle outside the police station. Authorities allege that the trio killed Galvez during an attempted robbery.
Galvez was a U.S. Marine combat veteran, having served in Afghanistan and Iraq.