Lightbearer DLC: Edit
Richard overhears Nick Lightbearer and Kitty talking to each other in the shop. He refuses to sell him a new guitar amp for seducing his wife and that he doesn't like musicians. He also hints that some music bloke had an "accident" at the Avalon Hotel park. However, Richard believes Nick may have had something to do with this.
It's revealed in a flashback that he was wandering around looking for his wife before getting brutally murdered by Foggy Jack.