That "something" was robbing a Brooklyn branch of Chase Manhattan with accomplices Sal Naturale and (briefly) Robert Westenberg. Fifteen hours later, Naturale was dead and Wojtowicz was in custody, facing a 20-year sentence. Notoriety followed with Lumet's 1975 film, but Wojtowicz was barely heard from in the ensuing 30 years, dying of cancer in 2006 at age 60.
Taken on their own, those events would add up to a pretty impressive legacy. But what makes The Dog so compelling isn't Wojtowicz's cinematic imprint but the place in history that was very likely denied him by chance and his own irascibility. Berg and Keraudren spent 10 years making The Dog, interviewing Carmen, the first of his four wives (if you take Wojtowicz at his word, always a risky proposition), his mother, journalists, former colleagues in the gay-rights movement and one of his former hostages. The portrait that emerges is one of a vulgar opportunist, true, but also of someone who came that close to much wider notoriety.