Charlie Sheen's Character Run Over By A Train

Sources at Friday night's taping tell us ... Harper married Rose -- the neighbor/stalker he flew to Paris with last season -- but things went downhill quickly when she found him in the shower with another woman.

In the episode, we're told Rose speaks at the funeral and recounts what happened to Charlie ... saying the day after the shower incident she and Charlie were waiting for a Paris subway when Charlie "slipped" and the subway literally blew him apart in a "meat explosion."