Maxine Davison, also known as Maxine Chapman, 51, was killed by the 22-year-old on Biddick Drive in Keyham on Thursday evening, Devon and Cornwall Police confirmed.
Jake Davison then shot a three-year-old girl, now named Sophie Martyn, and her 43-year-old father, Lee Martyn.
The shooter shot two residents – a 33-year-old man and a 53-year-old woman – who both sustained serious injuries that are currently not considered life threatening.
Davison then entered a nearby park, where he killed 59-year-old Stephen Washington before shooting 66-year-old Kate Shepherd in Henderson Place. Ms Shepherd later died at Derriford Hospital.
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His carnage lasted about six minutes before he turned the gun on him.
He was reported dead at 6:23 p.m., just minutes after the police alerted at 6:11 p.m.
All those killed lived locally in the Keyham area.
The firearm used by Jake Davison was legally owned.
Prime Minister Boris Johnson said the question of how the attacker came to legally own a firearm should be the subject of “proper investigation” as he called the shooting an “absolutely appalling incident” “.
Police said Davison had a gun license in 2020, that there was no reason at this time and that the gun – which witnesses described as a shotgun – was recovered from places.
Devon and Cornwall Police Chief Shaun Sawyer said there had been a “considerable” number of phone calls to emergency services and police arrived at the scene within six minutes. .
It is not yet clear whether the suspect knew the rest of the victims, but he said Davison, who lived locally, “knew people on this street”.
“We believe we have an incident which is linked to the house and which has taken hold on the streets and has seen several people in Plymouth lose their lives in extraordinarily tragic circumstances,” he said.
Speaking to Sky News, Police Chief Sawyer added: “In my day we never had a homicide followed by a rampant gun attack on random members of the public and then dead. It is unprecedented in my time as chief of police. ”
He called the shootings “truly shocking” and said they were seen by members of the public, whom he urged to seek help.
Police are now collecting evidence from around 13 or more crime scenes, he said.
Davison has been named as the alleged shooter earlier today.
In videos shared online weeks before the massacre, he spoke of being “beaten” and “overcome by life.”
Davison, who posted on a YouTube channel as Professor Waffle, said he was “no longer willing to do anything” in a recording dated July 28.
In several clips, he has referred to “incels” – an online abbreviation for “involuntary celibacy,” the online subculture that involves men who are unable to find a romantic or sexual partner despite desire, often expressing a hostility and extreme resentment towards those who are sexually active, especially women.
Although he said he had not “cleared up” like an “incel,” Davison spoke of “people like me have had only themselves.”
YouTube confirmed in a statement that the account on its Davison-operated platform has now been terminated because it “violates our offline behavior policy.”
Police Chief Sawyer said the police “were not considering terrorism or a relationship with a far-right group or anything like that,” but would investigate his computer hard drive.
He also said he couldn’t say ‘at this time’ if Davison had any mental health issues, but added: ‘It’s an extraordinarily unusual response from another human being. “
On Friday afternoon, Police Chief Sawyer and Alison Hernandez, the area’s Police and Crime Commissioner, visited Biddick Close to speak to officers at the scene.
More than two dozen floral tributes were left outside a Lidl supermarket near the scene of the shooting. Among them were bouquets of civic leaders.
Plymouth Mayor Councilor Terri Beer wrote: “My deepest condolences go out to the families, friends and loved ones of those in our community who have been lost, injured and touched by this tragic event. ”