Matlock (1986)

Season 1: Episode 17

Seven years ago Ben defended Les Matthews, who was accused of killing his friend and business partner and Ben lost. Today Matthews has been granted parole. While working in the library, Wayne Lashley enters with his two goons, Lipton and Foley. While Lipton and Foley keep watch, Lashley tries to kill Les, but in the struggle, it's Lashley who ends up dead, and Les who ends up looking guilty. Matthews is charged with Lashley's murder and Ben wants to defend him. He sends Tyler undercover in the prison and places him with the cellmate of the man who was killed. He gives Ben evidence that not only proves Matthews is telling the truth but also who was responsible for the murder that Matthews was convicted of seven years ago.