Actor Conrad Janis, best known as Pam Dawber's father on the popular television program Mork & Mindy, is believed among the deceased in a mid-air collision of two filled-to-capacity Delta Boeing 747s Monday which left no survivors. Janis, who co-starred as Fred McConnell on the ABC sitcom from 1978 to 1982, was approximately 45 miles from the Pacific Coast when the tragic accident occurred. Janis, 71, also appeared in numerous films, most recently in 1996's The Cable Guy. While a search of the ticketing database has not yet determined whether any of the other 836 passengers were celebrities, the FAA has promised a full inquiry into Janis' death. 