Show bosses recently confirmed that one character will die when Emmerdale goes live later this month, although the identity of the unlucky individual is being kept firmly under wraps.
> 'Emmerdale' 40th anniversary - full coverage
Bookmaker Ladbrokes has now told Radio Times that it is placing Alan as the frontrunner in the mystery, leading the way with odds of 3/1.
Actor Richard Thorp has played the role of Alan since 1982, making him Emmerdale's longest-serving cast member.
Carl King (Tom Lister) is second favourite with odds of 4/1, while Betty Eagleton (Paula Tilbrook) and Cameron Murray (Dominic Power) follow in joint third with 5/1.
Sarah Sugden (6/1), Paddy Kirk (8/1) and Ashley Thomas (8/1) are also seen as likely candidates by the bookmaker.
Emmerdale's hour-long live episode will air on Wednesday, October 17 from 7pm. Cast and crew began rehearsing for the broadcast earlier this week.