This guy defined what a tough cop is. Franz really is one of the best actors in the business in portraying what a gritty, tough nosed, cop should be.
Forget about the other imposters out there (Vic Mackey) Franz's portrayal came way, way before. Characters like Andy Sipowicz and Det. Sal Benedetto in "Hill Street Blues" really showed all the depths that a cop should be.
Andy was tough, gritty but could be also loving, caring and smart. Steven Boncho was smart he didn't just make this guy into an uncaring, criminal pig who abuses the badge to get what he wants. He did overboard sometimes but it's not to the absurd level that other shows do (like "The Shield") for shock value. Nope Sipowicz lost and gained partners, loved ones and through all this he really did grow as a person.
Then you take a look at Franz's work with over thirty years in the business with memorable movie roles in flicks like "Blow Out", "Dressed to Kill", and "The Fury" and it's quite a decent list of work he's done.
He's definitely the best actor in a cop drama ever and very few people really come close to him if any.