Henry Burnett came to believe that, given the chance, Margaret would leave him, so he took to locking her in the house whenever he went out. This was not a state of affairs which Margaret relished, so when by chance she met her estranged husband on 31 May, she agreed to go back to him. Margaret Guyan arrived at 40 Skene Terrace at 4.00 pm to collect her son Keith. A family friend, Georgina Cattanagh, went with her for moral support. As soon as Margaret announced her intention to go back to her husband, Burnett cried "Margaret, Margaret, you are not going to leave me!" He then drew a knife to Margaret's throat, closing the door behind them. Fearful of what was happening inside, Cattanagh banged repeatedly on the front door and demanded the release of Margaret. Minutes later, Burnett threw open the door and ran off down the street. Margaret was shaken, but relatively unhurt. The two women made their way back to 14 Jackson Terrace. Burnett went to his brother Frank's workplace and told him what had happened; his brother urged him to go to the police. But Burnett, still set on revenge, instead went to Frank's house in the city's Bridge of Don area to borrow his brother's
shotgun. Because Frank's wife had been told never to lend the gun to anyone, Burnett forced the cabinet open and stole the gun, along with some cartridges, after which he boarded a bus to 14 Jackson Terrace. He arrived at the Guyans' flat and forced his way in. After Cattanagh screamed "You can't come in here!", Thomas Guyan jumped to his feet to see what the problem was. As he opened the kitchen door, he was met by Burnett, who was carrying the gun. A shot rang out and Guyan fell dead, having been shot in the face at close range. Burnett then took Margaret out of the flat at gun point; on the way down the stairs, he threatened a young boy from a neighbouring flat. Burnett dragged Margaret down a lane and as far as a garage on Seaforth Road, near the main route north out of Aberdeen. John Innes Irvine was filling his car with petrol at the garage when Burnett demanded his car. Irvine tried to stop Burnett from stealing the car, but was threatened with the shotgun. The police were soon notified of the theft and began following the car, which was driving north towards
Peterhead. After driving for about 15 miles, Burnett pulled over near the town of
Ellon and offered no resistance as he was arrested by Constable James G. Raeper and Constable Mitchell. == Trial ==