Britain's Got Talent fans 'rumble' The Witch's identity after live semi-finals

Britain's Got Talent fans think they have worked out The Witch's identity during Monday's live semi-finals.

The mystery contestant, who was later sent home,

left judges Simon Cowell, Amanda Holden, Alesha Dixon and David Walliams terrified during their performance.

With Alesha, 43, and Amanda, 52, even fleeing the studio after The Witch chased the latter with a rat

after the rodent magically appeared from a box on the panel during the act.

Many took to social media to share their thoughts on who they think the contestant is with fans

previously guessing that it's BGT hosts, Ant McPartlin and Dec Donnelly.

Viewers now think that The Witch is Stephen Mulhern and

he was working with Ant and Dec for the performance.