Gwent Police have named the man who died in Trellech on Saturday.
Police were called to Church Road at around 8:40pm on Saturday.
Paramedics confirmed that a 56-year-old man from Chepstow had died.
He has been named by officers as Matthew Oubridge, and his family are receiving support from specialist officers.
A 40-year-old man remains in police custody after his arrest on suspicion of murder.
DCI Matt Sedgebeer, the senior investigating officer, said: “As our investigation continues, officers will be making further enquiries so it is possible that you may see ongoing police activity as part of this work.
“Please do not be alarmed and if you have any concerns, then please do stop and talk to us.
“We want to hear from anyone with information who has not yet spoken to the police and particularly those with CCTV or dashcam footage between 7pm and 9.30pm on Saturday 4 December in Trellech.
“Anyone with details should call 101, quoting log reference 2100424065, or you can also send us a direct message on Facebook or Twitter. You can also contact Crimestoppers anonymously on 0800 555 111.”