Killer hides knife in base of clay sculpture

I am looking to find a movie I watched a while back. I thought it was on utube but unable to find it in the history. Any help would be appreciated. The movie starts with a killer getting out of prison or jail on a technically or lack of evidence. He's a sculpture artist who works with clay. He romances an art gallery owner or curator and she has a showing of his work. He keeps killing with a knife but doesn't get caught. Even though he is suspect she keeps defending him and possibly innocently giving him an alibi. I think he kills a man who is interested in her to eliminate competition. He marries the art gallery owner and the movie ends with him hiding the murder knife in the base of the sculpture he's making of his new wife. The movie ends with a sinister smile. It's not a new movie and there were no known actors in it that I can remember.