"The next moment, the bizarre creature that was a scholarly museum curator flits out into the velvet shroud of night ..."
[Notice the slight paste-up cut lines in the narrator box: something was changed in the text before printing.]
This story by Bob Haney seems to derive partly from the old Paul Robeson black and white film "The Emperor Jones."

Click image to view enlargments below from Brave and the Bold #117, 1974 DC Comics, featuring Jim Aparo Artwork
JIm Aparo index at Comic Book Brain
Jim Aparo "Creeper" page from Brave and the Bold #178 from 1981
New Jim Aparo collection coming from DC Comics. Hope it includes the run of Archie Goodwin-penned tales form the mid-seventies. Cover of the book (as advertised so far) is a recoloring of the art Aparo did for the cover of Brave and the Bold 111. See it at 1400 pixels here.