This was originally meant to be the series finale. There's a birthday party, celebrating a job well done, and then ends with Matlock (Griffith) looking over an empty court room, as though he's saying goodbye. The show stopped airing in its regular time slot, but resumed its run later that spring, by airing the remaining two episodes (that were in the can) in April and May of 1995, respectively.
Unusual case, in that it doesn't involve a murder.