callous Scots killer who murdered a friend has been cleared of claims he hounded his girlfriend for nine years after being released from jail over the killing.Steven Burns was caged for life in 1999 for murdering pal Patrick O'Dowd in their hometown of Barrhead, East Renfrewshire.He stabbed Mr O'Dowd, 26, in the stomach after his victim had asked him to leave a party due to his drunken behaviour.But Burns, 44, was released on parole in 2010 and began a relationship with Joanne O'Rourke, 41.And