Formula for a Murder (1985)

David Warbeck stars as an instructor who marries a traumatized, crippled woman. The wife suffers from PTSD and is tormented by a traumatic event that happened in her past. What is even more unfortunate is that her marriage is a just part of her maniac husband's evil scheme to kill her for her money. It isn't long before the formula is put into action and the gory body count starts to mount.