Toronto police have identified the 67-year-old man who was fatally stabbed in Scarborough on Tuesday night. Police said they responded to an apartment building in the area of Kingston and Galloway roads just before 7 p.m. When officers arrived, they located Robert Dawson with significant stab wounds. Despite life-saving measures, Dawson was pronounced dead at the scene. He is the city’s 28th homicide victim of the year. Police said they arrested a woman at the scene. In a news release on Wednesday, they identified her as Natasha MacCallum of no fixed address. She has been charged with second-degree murder. Police previously said Dawson and MacCallum knew each other but the exact nature of their relationship is unknown. Homicide investigators have not disclosed a motive. They are asking anyone with information about the stabbing to contact them at 416-808-7400 or Crime Stoppers anonymously at 416-222-TIPS (8477).