Roy, his arms spread wide, clearly believed Dharmasena should have signalled a wide delivery instead and the furious batsman had to be ushered away from the crease by square leg umpire Marais Erasmus.
Roy's anger on the field was picked up by stump microphones, prompting broadcasters to apologise for the use of bad language.
Roy was the star of the show in England's blistering run chase as it charged into a World Cup decider for the first time since 1992, obliterating the Aussies by eight wickets in a one-sided show at Edgbaston.
He avoided a suspension but did pick up two demerit points and a fine worth 30 per cent of his match fee.
However, the umpire also holds an unwanted record involving England.More news: Man shot and killed by police outside Tacoma ICE detention facility
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Dharmasena was a bit late to give his decision, leaving Roy angry.
But Cowan, speaking on ABC Grandstand's World Cup podcast, said his behaviour was an "absolute disgrace". Dharamsena was wrong in giving Roy out and it led social media to run a campaign to remove the umpire from the final.
But ICC's selection of umpires for what is admittedly the most important ODI game of the year, did not sit well with fans after Kumar Dharmasena got involved in a controversial situation on Thursday, 11th July during the England-Australia semi-finals.
All the above mentioned officials were also a part of the second semi-final.
Roy admitted the offence and accepted the sanction proposed by match referee Ranjan Madugalle, of the Emirates Elite Panel of ICC Match Referees and, as such, there was no need for a formal hearing.