Authorities say Enchategui confronted the two men after they broke into an apartment to look for prescription drugs.
Flack says the defendants were unaware Enchautegui was a police officer because he was off duty.
The Patrolmen's Benevolent Association says about 70 police officers filled the small Bronx courtroom.
Brancato and Armento are being tried separately. Brancato's murder trial is set for Oct. 28.
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