Detectives are investigating what they believe to be the fatal stabbing of a man at a home in Melbourne's west overnight.
Emergency services were called to a St Albans address on Belfort Street just after 12:30am, with reports a man was seriously injured.
Police said the injured man was transported to hospital in a critical condition, but later died.
Homicide detectives arrested another man, believed to be known to the alleged victim, at the scene.
An investigation is underway and police have asked for anyone with information to contact Crime Stoppers on 1800 333 000 or online.