Scream Bloody Murder (also known as Matthew, Claw of Terror and The Captive Female) is a 1973 American slasher film written, directed, and produced by Marc B. Ray, and co-written by Larry Alexander.
At the age of eighteen, Matthew is released from the asylum, and returns home, discovering that in his absence his mother has married a neighbor named Mack Parsons.
In the morning, a distraught Matthew hitches a ride with a young couple, whom he also kills, beating in the man's head with a rock and drowning the woman in a roadside stream.
Wanting to impress Vera and give her a better life, Matthew bluffs his way into a mansion, where he smothers the owner with a pillow, hacks the maid to death with a cleaver, and beheads the pet dog.
[2] A grade of 2½ out of 5 was given by Hysteria Lives!, which said "It may drag, but for what Scream Bloody Murder lacks in genuine thrills it makes up for with the kind of unpredictability you only seem to get with low-budget 70s horror, where it always feels that anything might happen".