Nightmare in Wax

Nightmare in Wax is a 1969 horror film. Cameron Mitchell plays Vince Rinaud, a former film special effects artist who is disfigured by Max Block, the head of Paragon Pictures, and also a rival for the affections of a woman Anne Helm. Leaving the film industry, Vince becomes a recluse and opens a wax museum. Within a few months, four popular Paragon stars disappear. Wax figures of the missing stars soon feature as wax models in the museum and the police become suspicious.

Source: Wikipedia