Miss Mary Speir Gunn (31 August 1862 – 18 October 1913) was murdered at the isolated Northbank Cottage near Portencross in North Ayrshire, Scotland on the evening of 18 October 1913. Her sister Jessie McLaren was also shot through the abdomen and her brother-in-law Alexander McLaren was shot in the hand. Papers described the murder at the time as ‘a terrible and most mysterious tragedy’.