Thames Valley Police has launched a murder investigation after an incident in Aylesbury in the early hours of Thursday morning.
Police were called to a residential address in Harcourt Green just before 1am, following an altercation between two men that ended in a serious assault.
53-year-old Mark Austin of Coxhill Way, Aylesbury died yesterday at Stoke Mandeville Hospital.
A 49-year-old man who was arrested shortly after the incident on suspicion of GBH has since been sectioned under the Mental Health Act.
The murder investigation is at a very early stage, however the victim and the suspect knew each other and this was not a random attack.
Anyone with any information regarding this incident should contact the Major Crime Incident Room at Taplow via the non-emergency number, 101.
If you don't want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.
No personal details are taken, information is not traced or recorded and you will not go to court.
More top news
Thursday morning's weather for the west of the region
Thursday morning's weather for the east of the region
Simon's Blog - Faces In Unexpected Places