Dementia 13 (1963)
Future Oscar winning director Francis Ford Coppola wrote and directed this this classic chiller.
A scheming young woman who inadvertently caused her husband's death, attempts to have herself written into her rich mother-in-law's will. She visits her late husband's family in Ireland, but an axe-wielding maniac interrupts her plans.
https://archive.org/details/RogerCormansDementiaThirteen720p
This film is public domain.
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Mike Flugennock commented
I first saw this on the local late-night "creature feature" when I was about 15, and still think it's a cut above anything else of its kind at the time -- especially considering it was produced by Corman.
Of course, Coppola's script and direction probably had something to do with it. Watching it again for the first time a couple of years ago, it was fascinating to see Coppola's visual and storytelling style already maturing.
This is one of two Corman pictures I actually think are (gasp) "too good to riff" -- the other one being 1957's "Not Of This Earth".