Sheila Washington said: “Stephen was a devoted family man, a loving husband, father, grandfather and best friend.
“Since the devastating events a couple of days ago, our world has been turned upside down in the blink of an eye and he will be sorely missed by everyone who knew him.”
Jess Morcom, a journalist at PlymouthLive said “you only had to take one look at him to see how much he loved and adored his family”.
Witnesses told police Davison turned the weapon – described as a pump-action shotgun – on himself before armed officers could engage him.
The police watchdog will now investigate the Devon and Cornwall force over the gunman’s possession of a shotgun and shotgun certificate.
The police face scrutiny over their decision to return the firearm to Davison after it was removed from his last December, following allegations of an assault.
It is not yet known if this particular weapon was the one used in the attack.
Prime Minister Boris Johnson described it an “absolutely appalling incident” amid calls for the issue to be properly investigated.