A policeman shot dead at the scene of a domestic argument was a father-of-two in his 40s, the BBC understands.
The armed response unit officer has been widely named as Pc Richard Gray.
The gunman is said to have killed himself following Sunday's shooting in Shrewsbury, Shropshire, which was reported to have come after a row.
West Mercia chief Paul West said the PC's family was "understandably devastated". He was reportedly praised recently after tackling a gunman.
The force said a police armed response unit was called to attend a "domestic incident" at 0610 BST on Sunday.
Detective Chief Inspector Sheila Thornes, who is heading the investigation, said the dead constable's weapons had not been fired.
"The ammunition allocated to the officer is all accounted for and there is no evidence of police weapons being discharged," she said.
She said they were not looking for anyone else in connection with the shooting.
The suspected gunman was found dead at the scene close to his flat and a weapon was recovered.
Neighbours said they saw the gunman in the early hours of the morning on the roof of a garden shed throwing stones at the windows of his flat.
He was described as a quiet fishing and shooting enthusiast.
Eyewitnesses reported hearing two loud bangs
The BBC's reporter at the scene, Anthony Bartram, said he was reported to be Peter Medlicott, a former game-keeper, who is in his 30s.
He said the shot officer was understood to have been commended for bravery earlier this year for tackling a man armed with a semi-automatic pistol in the town in April 2006.
West Mercia Police are yet to formally announce the identities of the men.
The police officer was taken to the Royal Shrewsbury Hospital, where he was pronounced dead on arrival
Post-mortem examinations on both men have yet to be carried out.
The Independent Police Complaints Commission (IPCC), which investigates shootings involving police officers, has been informed.
Chief Constable West said the force had been profoundly affected by the officer's death.
He said: "The whole force is extremely shocked and saddened by the death of one of our colleagues and it is important to remember that another man has also died today."
Police have made a fresh appeal for witnesses to contact them on 08457 444 888.