The Hallmark Mystery Movie Channel is airing “Prescription: Murder” tomorrow on what happens to be the 50th anniversary of its first broadcast (2/20/68). It looks like it’s just a coincidence because this is the episode that would have been airing on 2/20, anyway. “Ransom for a Dead Man” follows on Wednesday, and the rest of the 2 hour episodes follow subsequently in chronological order. But an interesting and significant coincidence!