Tina will be seen falling from a balcony at the builders' yard after a dramatic confrontation with her killer on Tuesday.
William Hill spokesman Rupert Adams said: "There was a real rush to back Tony - including a number of new account openings. We fully expect Tony to be unveiled as having done the dastardly deed!"
Producers of the show say there will be a 'shocking twist' on Wednesday, the night after her death plunge, just as the police begin their efforts to track down who is responsible.
See also: Who kills Tina? All the news, spoilers, pics, previews, interviews...
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