Dragnet - Season 4 - Eps 7: Homicide - Cigarette Butt
Joe and Bill investigate a dead body found in a rundown apartment building. A half eaten peanut butter sandwich and a knife are found at the scene of the crime. A neighbor says that he saw a man and woman running out of the apartment. The man and woman come back and tell Joe and Bill that it was self defense. Joe looks for evidence that will prove or disproves the alibi.
About Dragnet

Title: Dragnet
First Air Date: 1967-01-12
Last Air Date: 1970-04-16
Status: Ended
Rating: 6.9/10 (from 15 votes)
Language: EN
Seasons: 5
Total Episodes: 98
Network: NBC
Genres: Crime, Drama, Mystery
Production Companies: Universal Television, Dragnet Productions, Mark VII Ltd.
Synopsis
Police Detective Sgt. Joe Friday and his partners investigate crimes in Los Angeles.
Cast

Harry Morgan
Officer Bill Gannon

Jack Webb
Sergeant Joe Friday