Colin Stewart was found collapsed on his doorstep by a neighbour
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The family of a man still on a life support machine three days after a fight at a garage have appealed for witnesses to come forward.
Colin Stewart was assaulted at the Esso garage in Franklyn Road, Haywards Heath, on Saturday night.
Sussex Police said on Tuesday the 32-year-old remained in a critical condition after surgery to remove a blood clot on his brain.
His brother, Davey Stewart, 35, appealed for anyone with information to contact the police.
He said: "It started as a silly little argument in a petrol station to do with queue jumping.
My brother doesn't deserve to be in a critical condition in intensive care for a stupid little argument
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"Nobody deserves to be in that position - my brother doesn't deserve to be in a critical condition in intensive care for a stupid little argument."
Colin Stewart was with his brother in a white Metro when they drove into the garage just after midnight on Saturday, police said.
It appears one of two men from a van which was also parked at the garage accused Colin Stewart of jumping the queue in the shop.
The dispute continued on the forecourt and turned into a fight which was broken up by Davey Stewart.
Davey Stewart has appealed for witnesses to contact the police
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The two brothers went home but Colin Stewart was found by a neighbour collapsed outside his front door at 0130 BST.
Detective Constable Clinton Novelle, of Sussex Police, said: "We are classifying it as an assault, as a grievous bodily harm, but there is the problem that if he dies we would have to upgrade the inquiry to a murder or manslaughter inquiry.
"At the moment Colin is still critical on a life support machine and it is still too early to say what the prognosis will be."
Sussex Police are keen to speak to a young man in a dark t-shirt who was in the shop.
Two men were arrested on Sunday but have been released on police bail.