I would agree with the fact that he was full of it, but with one caveat: Unless he had some other means of income, he would have had to kill a helluva lot of people to raise a family in the manner he did.

How long did he keep up his facade, 20 years? Even if he only killed 3 people a year to support his family, that's a lot of people.

Just guesstimating obviously. I don't know what the going rate for a murder was, and maybe he stole cars etc. as well. But if he was really a full time hitman I would imagine you would have to do them fairly often to keep up the appearance of a middle-class businessman.