Silent Rage (1982)

Dan Stevens is the sheriff of a small Texas town who checks out a disturbance which turns to murder. The killer is still in the house and he tries to kill Dan, but Dan stops him and arrests him. The killer attempts to flee, but is shot and killed and is taken to a medical institute. Three doctors, led by Dr. Philip Spires, operates on the killer and brings him back to life using a formula that the three doctors made and the killer is made indestructable. Dr. Tom Halman tries to terminate the killer, but he and his wife are killed. After the two remaining doctors are killed, the killer goes after Dr. Halman's sister Alison, and it's up to Sheriff Dan Stevens to stop him.