A 44-year-old man has died after being involved in a fight with another male patron at the Kingston Hotel in Canberra's inner south.
Police said the altercation happened on Sunday about 9:15pm while there were up to 30 people inside the hotel at the time.
Detective Acting Superintendent Matt Reynolds said while police suspected alcohol was involved, they were still investigating the circumstances surrounding the death and had not ruled out a one-punch attack.
"There were no weapons involved," he said.
"To my knowledge there was no glass involved in the incident.
"In terms of the injuries to the male, we're still going through the process of forensically investigating any injuries to him."
Staff, paramedics and police provided CPR to the man, but he died at the scene.
Detective Reynolds said it was unknown whether the men knew each other.
"There is no-one in custody at this stage," he said.
Police are reviewing CCTV footage and speaking to witnesses and hotel staff.
"Obviously that's a very distressing incident for members of the public and the staff," Detective Reynolds said.
Anyone who has information and has not already spoken to police is urged to contact them.
