Night Fright

Night Fright is a 1967 American sciencefiction horror film directed by James A. Sullivan that was shot near Dallas, Texas.

A Texas community is beset by a rash of mysterious killings involving some of the students from the local college. The sheriff investigating the deaths discovers the startling identity of the killer responsible for the murders. A NASA experiment involving cosmic rays has mutated an alligator into an ogrelike form and bulletproof unstoppable killing machine with a thirst for blood.The soundtrack was performed by the Houston, Texas garage band The Wildcats. The band also played in another movie scored by Christopher Trussell also filmed in 1967 entitled Fulfillment Something Worth Remembering. ........

Source: Wikipedia