Right now that's the $64 question for me. My best guess is that the first two were con men who fleeced smalltown people in some kind of real estate scheme (they talked about making a big score. The fact that the envelope which Richard took had a title insurance company name leads me to think it was real estate). Richard killed the third guy in his real estate office and was claiming he was only a moneyman in the deal.

I'm thinking that Richard's sister (seen at the end of the episode) was swindled by these con men and Richard avenged that wrongdoing before going home to settle down.