A murder inquiry is under way after a man was found dead in Hertfordshire following a disturbance, police said.
The man, who is yet to be formally identified, was found injured at an address in Northfield, in Hatfield at 23:30 BST on Wednesday.
He was taken to the Lister Hospital in Stevenage where he died. He is thought to have suffered stab wounds.
Det Insp Martin Brunning said: "We would like to speak to anyone who saw or heard anything unusual."
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