Co-defendant Steven Armento, who shot the officer, was convicted of first-degree murder Oct. 30. He faces life in prison without parole at his Nov. 14 sentencing.
Authorities say Enchautegui confronted Armento and Brancato when the two broke into an apartment to steal prescription drugs.
Brancato has said he didn't know Armento had a gun.
The 32-year-old actor played an aspiring mobster in HBO's "The Sopranos."