Four men have been arrested on suspicion of murdering a man who was found injured at his home.
The 23-year-old, who has not been named, died from a single puncture wound to his stomach, a post-mortem examination revealed.
Police and paramedics were called to Elliman Avenue, in Slough, Berkshire, at about 1830 GMT on Tuesday.
Two men aged 23 and 26 and two aged 30 are being questioned. Three are from Slough and one is from west London.
All four are believed to have known the victim, who died at Wexham Park Hospital, Thames Valley Police said.
Det Supt Rob Mason said house to house inquiries had been carried out and appealed for anyone with information to contact police.
The victim's family have been told about his death, he added.