Detectives want to speak to anyone who saw a man leaving a house in Berkshire where a man was found fatally wounded.
Opinderpal Singh Randhawa, 23, was found by police and paramedics with a stab injury at his home in Elliman Avenue, Slough, on Tuesday evening. He died an hour later in hospital.
Post-mortem tests showed he died from a single puncture wound to his stomach.
Two men aged 30 and another aged 26 have been arrested on suspicion of murder and bailed until 7 January.
A fourth man, 23, was released without charge.
Police have appealed for anyone who saw an Asian man in his 20s leaving the house shortly before 1830 GMT to contact them.
Det Supt Rob Mason, of Thames Valley Police, said: "The individual may have drawn attention to himself by either walking or running away from the address.
"From our investigation, we know that the victim sustained his injury at his home address that evening.
"We also know that there were a number of men at the address, all believed to be known to the victim.
"We continue to pursue a number of inquiries."