KOLCHAK: The Night KILLERS. What Happened To The Third Movie?

KOLCHAK: The Night KILLERS. What Happened To The Third Movie?
https://www.youtube.com/watch?v=JfFQVioENEg
When Kolchak, The Night Stalker movie debuted on ABC's movie of the week in 1972, it quickly took the record for highest rated TV show of all time prompting a 1973 sequel called The Night Strangler. A third film was slated for production...but what happened to it?

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