A man died after being assaulted at a New Year's Eve party in Bedfordshire.
Police and ambulance crews were called to an address in Hemsley Close, Luton, at about 03:00 GMT.
The man, aged in his 40s and from Luton, died a short time after being assaulted at the house party, police said.
Officers are appealing for people who were at the event to come forward. The area is cordoned off as detectives investigate the death.
A police spokeswoman said: "We are treating the death as suspicious.
"The man has received fatal injuries following an altercation at the party."
The man was found outside the property, in the town's Hockwell Ring area, and was pronounced dead within an hour of emergency services arriving at the scene, the spokeswoman said.
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Post-mortem tests are due to take place later.