There's a spoiler which explains further what kind of 'accident' that led to his death in the season premiere.
"Two and a Half Men" producers may have tried to seal the story of how Charlie Harper dies but the information leaks anyway. [Spoiler Alert] Previously, the taping audience reportedly heard that the character played by Charlie Sheen would be dead due to "accident", but apparently it is not just as simple as that.
The last time audience saw of Charlie was when he got on a plane to Paris with his creeper slash stalker neighbor Rose. Turns out, the season premiere would reveal that Charlie walked down the aisle with Rose but then cheated on her while they were still in Paris. According to Perez Hilton, she caught him in the shower with another woman.
The "accident" here becomes a very complicated word because Rose said during the eulogy that her husband "slipped" into a Paris subway rail and was shred to pieces, causing a "meat explosion". Although it is not yet confirmed, there's a possibility that Rose gave that necessary shove out of rage.
The season premiere airs September 19 with Ashton Kutcher playing new character. Sheen said that he would watch the episode from his home.