If a network cancels a show after a single episode, it pretty much means that the show never should have been on the air in the first place.
Case and point: Secret Talents of the Stars. Why would anybody would want to see only mildly famous people perform things that they are not actually talented at? They wouldn't. Thus, nobody watched and the show is now gone from the schedule after a single episode.
I had the displeasure of watching a single clip of the program and it struck me like a performance from a bad high school talent show. Embarrassment all around.
48 Hours Mystery will now occupy the time slot (Tuesday at 10pm) until April 29, when Shark will return (a new time slot for the program).