Nightkill
Nightkill is a 1980 thriller film directed by Ted Post. It stars Robert Mitchum and Jaclyn Smith. It is about an adulteress who hatches a plot to murder her millionaire husband while her lover assumes his identity.
Kathy is horrified as Wendells dead body is placed inside a freezer. When a police detective, Lt. Donner, turns up asking questions, claiming Wendell never turned up in Washington for a scheduled business appointment, Kathy panics and decides to move the body. But when she opens the freezer, instead of finding Wendells corpse inside it, she finds Steves.
Source: Wikipedia
