The Brooklyn actor who played Johnny Cakes the gay-fireman lover of a mob capo on "The Sopranos" killed himself in a holiday tragedy that has stunned family and friends.

The front door to John Costelloe's Sunset Park home was still sealed with police stickers yesterday, more than a week after the rugged 47-year-old actor committed suicide.

Costelloe, a former FDNY firefighter, shot himself in the head in his basement bedroom on Dec. 16, cops and pals said.

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