15TH January 1974Cindy Williamson“Hawaii Five-O“Season 6 : Episode 18“Secret Witness“

15TH January 1974
“Hawaii Five-O“
Season 6 : Episode 18
“Secret Witness“  
Cindy Williams
1947-2023
(died aged 75)  

Five-O races to find the witness to a hit on a bagman of a local mob. The witness, who narrowly escaped being killed himself, had dropped a library book with his library card inside, providing the hitman with the name of the witness.
The witness's wife, Sue Reynolds (Cindy Williams), doesn't want him to go to the police. Five-O's main clue is a letter the witness wrote to the Honolulu Star-Bulletin's "Secret Witness" feature, that seeks tips for unsolved crimes.