A prolific actor known to crank out up to six films a year, Jeff Fahey was pretty much hovering around “vaguely familiar-looking” status when he joined the cast of the hit “Lost” (ABC, 2004- ) in the fall of 2007. Fahey had enjoyed a few high-profile roles in the 1990s, starring in the creepy thriller “Lawnmower Man” (1992) and two seasons of the action drama “The Marshal” (ABC, 1992-94), but he had largely been content to be a working actor, appearing mostly in low-budget independent genre films for overseas and DVD distribution. A 2007 role in Quentin Tarantino and Robert Rodriguez’