The Jack-O-Lantern Murderer

The Jack-O-Lantern Murderer is a monster that can, presumably, turn humans into Jack-O-Lanterns. The streak of murders goes back until 1938, so the murderer or monster likely has a prolonged lifespan. Judging from episode 05 - Another Time, Another Place, the murderer might be a humanoid male with no hair, who is wearing a black suit and riding a horse.

Recorded murders
1938- 3 people, the Dhondt family

1947- 13 people in a cabin in Colorado

October 31st, 1978- 399 in Palomar, Northern California, 7 out of 9 survivors are missing presumed dead