I saw this on TV as a young kid in the Midwest in the 70s. I think it’s from the 60s or 70s due to the photography, but it is possible that’s just a long ago, warped memory. This is NOT House of Wax.
The killer is freezing people and posing them. I think he’s storing his collection of statues in a well lit, freezer. One of the statues is an amazon or warrior with a bow and arrow. Someone, possibly the police, interrupt the killer and the temperature rises, partially melting the statues. The warrior melts enough to loose the arrow, killing the killer.
I must of have been four or five when I saw this so I cannot be sure about the story elements above.