According to Bustle:
Fans of American Horror Story were first introduced to Richard Ramirez (aka the Night Stalker) in Season 5's Hotel, when he arrived at the Cortez for Devil's Night. Now, he's wreaking havoc at Camp Redwood on AHS: 1984. But a new fan theory may link him to yet another season: Apocalypse.
Season 8's Apocalypse was in and of itself connected to Murder House, Hotel, and Coven, but the main focus was Michael Langdon, the son of Vivien Harmon and Tate Langdon who killed his nanny in Murder House. He grew up to become the Antichrist and tried to take over the world, but was ultimately killed by the witches of Coven. However, 1984 assumedly takes place before the events of Apocalypse (which was set in 2019), and Michael's demonic powers and worship of Satan seem to at least somewhat parallel the Night Stalker's storyline at Camp Redwood, leading some fans to wonder if the Night Stalker, too, could be an Antichrist.
What you think?