Jeremy Clarkson is to be sacked as Top Gear presenter after a BBC investigation concluded he did attack a producer on the programme.
Lord Hall, the Director General of the BBC, was expected to announce his decision overnight after considering the findings of an internal investigation.
Clarkson, 54, was to be thanked for his work on the hugely popular motoring show, but would be told such behaviour cannot be tolerated at the corporation.
It is understood a report into the so-called "fracas" at a North Yorkshire hotel concluded that the presenter spent 20 minutes verbally abusing producer Oisin Tymon, before launching a 30-second physical assault on him.
The outburst came after Clarkson, one of the BBC's best paid stars, was informed he could not have steak and chips after a day's filming because the hotel where they were staying had stopped serving hot food. But despite finally deciding to axe the show's star presenter, the BBC plans to continue broadcasting Top Gear on BBC2.