Movies You Haven't Seen But Should: A Cold Night's Death

Wiki:

A Cold Night's Death (also billed as The Chill Factor) is a 1973 made for television movie in the United States. The film was shown on January 30, 1973, on the ABC network. The film was directed by Jerrold Freedman and starred Robert Culp, Eli Wallach, and Michael C. Gwynne. Culp and Wallach are two research scientists at the Tower Mountain Research Station (based on the University of California's White Mountain Research Station) who are trying to unravel the mysterious death of a colleague.