Simon Hamilton-Jewell was shot dead alongside his men as they defended an Iraqi police station from a mob of 400 last June.
Despite being offered the chance to escape, he stayed with his patrol to the end and was hailed a hero.
But today his brother, Tony, launched a fierce attack on the Government, saying the Military Police sergeant had died for "a lie". Mr Hamilton-Jewell said: "I have downloaded the transcripts of the Butler report. It's another whitewash. It's all hedging and ifs and buts."
Mr Hamilton-Jewell, 57, said he was disgusted that Lord Butler's report did not single out anyone for blame. "Butler says no single person is directly responsible," he said. "But, whether it's Blair on the political side or [John] Scarlett on the intelligence side, someone has to be ultimately responsible. The arrogance of Blair is extraordinary - he won't apologise." He also criticised Lord Butler's backing of Mr Scarlett in his new role as head of MI6.
"Butler turned round and said Scarlett is fundamentally in the wrong, but that he's a good man for the job Blair's promoted him to," he said. "It's hypocritical. Who do these people think they are? They are treating us like idiots."
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