A man found with fatal injuries at his Berkshire home has been named as Opinderpal Singh Randhawa.
The 23-year-old was found with a stomach wound at a property in Elliman Avenue, Slough, on Tuesday evening. He died later in hospital.
Post-mortem tests revealed he died from a single puncture wound.
Four men were arrested on suspicion of murder. Two men aged 23 and 26 and two aged 30 are being held. 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.
Police have been carrying out house-to-house inquiries and continue to appeal for anyone with information to contact police.