Residents on Linto Way in Alexander Heights have described their shock after their street was declared a crime scene this morning.
Police were called to a disturbance at a residence around 1:30am where they allegedly found a man in his 20s with multiple stab wounds.
He was rushed to Royal Perth Hospital but succumbed to his injuries and died a short time later.
A crime scene has been established, as police investigate.
Anyone with information is asked to contact Crime Stoppers on 1800 333 000.