AN autopsy performed on baby koala Doug shows his killer executed the defenceless animal at close range with an air rifle. Pictures: Doug the baby koalaVeterinarians believe the trigger was pulled by a person standing above Doug after shooting his mother Meryl. The dehydrated joey, who was losing blood, and his mother suffered immense pain for 10 days until found at the base of a tree in Morayfield, north of Brisbane, on Tuesday.