The incident, on Hamilton Drive in York, was reported at around 10.20pm on the night of Monday 27 July 2015.
A man with multiple stab wounds and was taken to hospital where he sadly died from his injuries.
Polcie are working to establish the man’s identity and his connection to the property.
A second man, aged 29, who was found injured in the street by a member of the public, was treated in hospital and discharged in the early hours of Tuesday morning.
A third man, aged 19, has been arrested in connection with the incident. He suffered a self-inflicted injury and is receiving hospital treatment.
Detectives are not looking for anyone else in connection with the incident.
Detective Chief Inspector Matt Walker said:
The incident has caused concern to local people but I would like to offer some reassurance to them that the suspect was quickly arrested at the scene and we are not looking for anyone else in connection with the incident. Our enquiries remain ongoing today and there will be a police presence in the area while we continue to investigate and gather evidence from the scene.
Our thanks go to local people who have been affected, for their patience and understanding while we deal with the incident. In particular, I would like to express our thanks to the member of the public who came to the aid of one of the victims.
Anyone who witnessed anything of the incident or has any other information that could help our investigation, I urge you to get in touch.
Anyone with any information is asked to contact North Yorkshire Police on 101, select option 1 and pass information to the Force Control Room.
Alternatively, if you wish to remain anonymous, you can pass information to Crimestoppers on 0800 555 111.