This guy was a real BTDT gunfighter. Cirillo was a member of the New York City Stake-Out Squad.
A quick overview of his life and death from some random blog
https://moderncombatandsurvival.com/featured/jim-cirillo-3-confessions-of-modern-day-gunfighter/
" Jim Cirillo , who was a member of the New York City Police Department’s Stakeout Squad (SOU), where he was forced to kill at least 11 men in the course of more than 20 gunfights during the 40-man unit’s some 250-plus stakeouts."
https://www.amazon.com/Jim-Cirillos-Tales-Stakeout-Squad/dp/1581606494