Celebrity Hall's Open Door By People Staff Published on October 27, 1998 12:00 AM Share Tweet Pin Email Walking out of TV shows is beginning to seem like an epidemic. Yesterday, The Daily noted the departures of Courtney Thorne-Smith and Gil Bellows from “Ally McBeal.” And don’t forget Kellie Martin, who announced her departure from “ER” months ago. (Tonight promises to deliver the bloody end of her run.) Today, Variety reports that Arsenio Hall is leaving his co-starring role in the CBS action drama “Martial Law” at the end of the season. He’s reportedly hoping to land a new series this fall, possibly on HBO. On “Martial Hall,” Arsenio played the comic sidekick to Sammo Hung. So far, there’s been no word on whether or not CBS will seek a new cohort for Hung.