Matlock - Season 4 Episode 14 The Witness

Sandra Townsend is senior counsel with Drexel, Harris and Townsend. But when she's off work she likes to let her hair down and go to the bars. When her lover threatens to expose her nightlife to her bosses, she murders him. Michelle takes the case when Matlock's former paperboy Jimmy Newton is arrested for murder (Matlock's off to California), but soon realises that Sandra, who is supposed to be the star witness, is really the killer. The problem is that Sandra Townsend is a former classmate and good friend, and Michelle just doesn't want to believe that she's lying.