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In that season’s finale, Milch wanted Sipowicz — who by this point had suffered the deaths of his eldest son, his partner Bobby, and his wife, and whose young son Theo was facing a medical crisis — to enter the hospital chapel and rant about all that God has taken from him. Tinker was on set. Franz was on set. The entire crew was on set. And, as usual by that point, there was no script. Milch ambled onto the set, realized everyone was waiting on him, announced that he needed someone to take dictation, and launched into a stream-of-consciousness assault on the Almighty, sounding very much like Sipowicz. Minutes later, Franz performed it word-for-word.
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Alan Sepinwall (The Revolution Was Televised: The Cops, Crooks, Slingers and Slayers Who Changed TV Drama Forever)