Thirty-five-year-old Eric Floyd and 41-year-old Levon Warner could face the death penalty if convicted of first-degree murder in the May 3, 2008, death of Sgt. Stephen Liczbinski.
Prosecutors say Floyd and Warner were in the getaway vehicle when suspect Howard Cain got out and shot Liczbinski, who was pursuing them after a bank robbery in the city's Port Richmond section. Cain later died in a shootout with police.
Floyd took the stand Wednesday and said he was asleep at the time of the shooting and denied any involvement.
On Thursday, prosecutors are presenting evidence about Floyd's criminal history to the jury.
Closing arguments are scheduled for Friday.
