Police probing love triangle scenario in fatal Sydney east stabbing POLICE are investigating whether a love triangle is at the centre of a fatal stabbing in Sydney's east. Emergency services were called to a unit block at Darling Point about 11.10am (AEDT) today. A 30-year-old man was treated for stab wounds but died at the scene. A woman, 28, who was also at the apartment was taken to hospital with minor injuries. A 28-year-old man has handed himself into police and is being interviewed at St Mary's Police Station. Rose Bay Police Acting Superintendent Damian Henry said it's believed the arrested man and the woman were in a relationship. "There is a domestic relationship (between) the female and the man at St Mary's (police station)," he told reporters. The full extent of those arrangements, it's early in the investigation, is yet to be determined. He did not know the details of the relationship between the dead man and the woman. Supt Henry said neighbours reported a man trying to enter the Mona Road apartment this morning. "Exactly what happened at the scene is yet to be determined," he said.