I'm looking for a series / a film, of which I particularly remembered the protagonist's opponent. This is a contract killer who is commissioned by an influential and Christian couple. He is supposed to kill the protagonist, but ends up making peace with him and allowing the protagonist to kill the client. The opponent has 2 children and his wife died of cancer. I watched it on Netflix and it reminded me a lot of Punisher.
Unfortunately, that's all I can think of.
Altered carbon?