Jon lives in a cabin in the woods with his brother Jim Traipsey. Both are reputed to be warlocks. In the fifties, Jon was a member of a satanic cult, along with Jim, Sheriff Bugahf, Mr. Glee, and Mrs. Glee. Satan visited them and sired the EVIL after getting drunk at a party they threw in his honor.
After his brother is killed by the EVIL, Jon tries to write a note detailing how the EVIL can be stopped; but he gets no farther than "keep your wits about you and your eyes peeled" before the EVIL kills him, literally peeling his eyeballs and scattering bits of his brain around him.