Just a fun fact: while it may be true that a priest can't tell anyone about confessions, they are also not required to give absolution. They might withhold it if, for example, a confessor shows no intent of actually stopping the behavior or if someone else is being punished for it.
I believe they are also allowed to report a confession to police if it will prevent a crime from being committed (which it arguably would, in the case of a hit man who comes back every time they kill someone).
Nah, you're thinking about shrinks. Catholic priests aren't allowed to report squat shit. Even if the guy making the confession says he's with a suicide terrorist group and they're building a nuclear bomb to wipe out the city, the priest must keep mum. If the bomb eventually explodes and millions die, too bad: it was God's will.
If you ask me, the two things about the priest that seem unrealistic are: one, he has a daughter; two, he doesn't appear to understand penance.
The daughter can be explained if we assume that he's a widower who was ordained only after his child was born and his wife died... but there's NO FUCKING WAY a Catholic priest would absolve someone like a hitman, a serial murderer, without giving them a truly grueling penance.
Here, where I live, the priests usually make you say padrenuestros and avemarías as penances, and no absolution for you till you're done. I know of children who had to recite fifty padrenuestros just for picking their noses. Our lady hitman, even with a lenient confessor, should have been forced to recite nonstop padrenuestros and avemarías until next year Friday, lol.