Mannix
Mannix is an American television detective series that ran from 1967 through 1975 on CBS. Created by Richard Levinson and William Link and developed by executive producer Bruce Geller, the title character, Joe Mannix, is a private investigator. He is played by Mike Connors. Mannix was the last series produced by Desilu Productions.

Season 7 · Episode 9 ·
Sing a Song of Murder
An opera diva emerges from retirement and is met with inexplicable attempts on her life.
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Episode 9 of season 7 of Mannix: “Sing a Song of Murder”. Aired 1973-11-11. Watch it online free on ZapFlix.