A 34 year old, former Australian soldier called Frederick William Everest conducted a violent campaign against the Americans in the latter stages of World War 2. Everest believed that ‘they were out to get him’. Two American officers, Lieutenant Allen C. Middleton and Petty Officer John D. McCollum were shot dead by Everest who was eventually apprehended and sentenced to Life Imprisonment. He was initially held in Boggo Road jail in Brisbane. He then spent the rest of his life in a mental institution. 

Lieutenant Middleton was shot dead as he left a public toilet and Petty Officer McCollum was shot dead on the verandah of his rented house at Alderley.

Frederick Everest was given the title of the "Man in the Grey Suit".

Roy Stephenson remembers seeing the "Man in the Grey Suit" in the Prison Section of Ward 15 at the Royal Brisbane Hospital in 1973. He was reportedly dying of cancer at that point in time.