An inquiry is under way after police were sent to the wrong address as they tried to intervene in a fatal stabbing.
Officers were alerted after a 999 call apparently warned of a possible knife attack in High Street, Sheringham, Norfolk.
However, the patrol car was sent to High Street in Wells-next-the-Sea - 16 miles away.
The Independent Police Complaints Commission is conducting an inquiry to see if a mistake was made.
John West, 61, was killed in the stabbing incident on 7 August.
On Friday, Chief Supt Kevin Wilkins, of Norfolk Police, confirmed officers did go to an address in Wells after receiving a call on the day of the incident.
"As soon as we were alerted to the fact that a mistake could have been made, we referred it to the family (of Mr West) and voluntarily referred it to the Independent Police Complaints Commission for an inquiry," he said.
The inquiry, which began on the day Mr West died, will examine a tape recording of the call and all aspects of the deployment to establish if any mistake had been made and whether his life would have been saved.
Mr Wilkins confirmed that the call handler who took the warning call was to be retrained.
A 35-year-old man has been charged with murder.