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Three other folks had been arrested in connection with the demise of a person whose frame was found at a nature reserve in Angus.
The body of Steven Donaldson, 27, was once discovered in a car park in the early hours on 7 June at Kinnordy Nature Reserve, Kirriemuir.
A 19-12 months-vintage woman and two men, both aged 23, have been arrested in connection with his loss of life.
Police thanked all people who had supplied data within the inquiry.