REVEALED: White supremacist, 28, who killed two black bystanders before being shot dead by police married his college sweetheart nine months ago at her 92-year-old grandfather's nursing home

On his social media Nathan Allen cultivated an image of a mild-manner healthcare professional who was in love with his newlywed wife, cared for rabbits and enjoyed European travel, but authorities in Massachusetts say that in private he harbored hate for black and Jewish people, which on Saturday exploded into deadly violence. 

Officials say Allen, a physical therapist with a doctorate who previously attended college with Boston bomber Dzhokhar Tsarnaev, crashed a stolen box truck into a home in Winthrop and then gunned down David Green, a 68-year-old retired Massachusetts State Police trooper, and Romana Cooper, a 60-year-old Air Force veteran, both black. 

A Winthrop police sergeant who responded to the scene shot and killed Allen moments after the homicidal rampage. 

Suffolk County District Attorney Rachael Rollins said during a press conference on Monday that Allen walked past several other people who were not black and didn't harm them.

Good on paper: Nathan Allen's social media posts portrayed him as a loving husband to his newlywed wife, Audrey (pictured on their wedding day last September), a healthcare professional and an animal lover. Police say he shot dead two black bystanders in cold blood 

Allen is seen brandishing a gun during the deadly incident in Winthrop, Massachusetts, on Saturday, which ended with the shooter being killed by the police  

Rollins also revealed that among Allen's possessions detectives found drawings of swastikas, along with 'troubling' racist and anti-Semitic statements written in his hand, which exalted the superiority of the white race and described whites as ‘apex predators. 

'We are learning more every day, but I am confident saying that there was hate in this man’s heart,' Rollins told reporters.

The district attorney added that investigators believe Allen acted alone, but they are still trying to determine when and how he became radicalized.   

Allen’s Facebook page mostly contains pictures of him with his wife, Audrey, from their travels in Vienna, Venice and Rome, as well as posts about adopting rabbits, as the couple had a pet rabbit of their own named Sigmund. The two met at the University of Massachusetts in Dartmouth, where they graduated in 2014.

They attended the university at the same time as convicted Boston Marathon bomber Dzhokar Tsarnaev. Their class had nearly 1,600 students, and it is not known if Allen and Tsarnaev knew each other.

According to his LinkedIn profile, Allen went on to earn a doctorate in physical therapy from MGH Institute of Health Professions in 2020 and previously worked as a caregiver at a nursing home and a rehabilitation technician. 

One of the victims was David Green, 58, a retired Massachusetts state trooper who served for 36 years and was described as the 'quintessential pro.' The second victim was Ramona Cooper, 60, a retired Air Force staff sergeant

Allen, 28, is seen in a driver's license photo provided by DA Rachael Rollins. Allen has been identified as the suspect who shot and killed two black bystanders in Saturday's alleged hate crime attack 

Allen's engagement to Audrey at the height of the COVID-19 pandemic last year was glowingly profiled by The Boston Globe and the couple were married on September 4 at the nursing home where the bride's beloved 92-year-old grandfather lived, with some 200 people tuning in via Zoom.

Audrey Allen, formerly Mazzola, has not made any public statements concerning her husband's actions. 

Nathan’s final post on Facebook appeared on June 22, when he wished his wife a happy birthday. He posted two pictures of the couple, including one of them kissing on their wedding day.

'Happy birthday to my beautiful wife Audrey Allen,' he wrote.

According to the couple's now-defunct wedding website, the two met at Birch Grille at UMass Dartmouth in October 2011 and went on their first date at a McDonald's nearly two years later.

'Seven years, three apartments, and two rabbits later, Audrey and Nathan decided to tie the knot amidst the backdrop of a global emergency,' read the description.

Nathan proposed to his college sweetheart on February 29, 2020, after Audrey returned home from a Bernie Sanders rally.

As reported by the Globe, the groom-to-be had filled their condominium apartment in Winthrop with candles and tied a note to the neck of the coupe's rabbit, Sigmund, which read: 'will you marry my dad?'

Nathan first met wife Audrey at University of Massachusetts in Dartmouth in 2011. The couple's engagement was glowingly profiled by the Boston Globe and the couple were married on September 4

The couple owned a condominium apartment in Winthrop, not far from the scene of Saturday's shooting rampage 

Allen, pictured dancing with wife Audrey, was said to have left his apartment on Friday night, never to return 

It is unclear at this time how Allen became radicalized, and when and why he legally obtained a handgun, which he was seen carrying on Saturday during the rampage. 

WCVB reported that Allen left his apartment on Friday night and never returned.

Police are still investigating whether Allen specifically targeted the victims because they were black. 

In a tweet on Monday mourning the two victims, Massachusetts Gov. Charlie Baker called the deadly attack in Winthrop a 'despicable act.'  

Before Saturday's fatal encounter, Allen wasn't on the DA's office's radar. He was married, employed had a doctorate and no criminal history, Rollins said.

'To all external sources he likely appeared unassuming,' DA Rollins said on Sunday.

'And then, yesterday afternoon he stole a box truck, crashed it into another vehicle and a property, walked away from the wreckage interacting with multiple individuals and choosing only to shoot and kill the two black people he encountered.'

Green’s longtime friend, Nick Tsiotos, said the two had coffee together just hours before the attack. He said the retired trooper had been sitting outside his home and tried to help after hearing the crash.

'He went out and tried to do what he was doing for 36 years with the state police: trying to help save lives and help save people,' Tsiotos, who attended high school with Green, told WCVB-TV. 'I really believe he saved people’s lives. Dave probably stopped him from going into homes and killing people.'

Allen attended the university at the same time as convicted Boston Marathon bomber Dzhokar Tsarnaev . It is not known if Allen and Tsarnaev knew each other

Massachusetts State Police Col. Christopher Mason said Green retired from the state police in 2016 after nearly 40 years in law enforcement. He also served in the Air Force.

'Trooper Green was widely respected and well-liked by his fellow Troopers, several of whom yesterday described him as a ‘true gentleman’ and always courteous to the public and meticulous in his duties,' Mason said in a statement. 'From what we learned yesterday, he was held in equally-high regard by his neighbors and friends in Winthrop.'

Cooper’s son, Gary Cooper Jr, remembered his mother as 'caring and selfless' and always ready to help anyone in need.

'We are heartbroken and she will be missed, just a senseless thing to have happened,' he said in a statement to WCVB-TV.

Cooper, who is survived by her son, two grandchildren, and her twin sister, most recently worked at a U.S. Department of Veteran Affairs facility on Boston’s Jamaica Plan neighborhood.

'She was a beloved colleague who will be greatly missed,' Kyle Toto, a VA spokesperson, told The Boston Globe on Monday.

Neighbors placed flower bouquets and other remembrances on the temporary fencing around the destroyed building in Winthrop over the weekend.

'Praying you are dancing in the sunshine and singing with the angels,' one note on the makeshift shrine read, The Boston Globe reported.

A gunman has shot two people in suburban Boston before being shot by police, in an incident that saw a plumbing truck crash into the side of a house

In this Saturday photo, the wreckage of a car sits on a sidewalk after a stolen truck collided it and crashed into a building before a suspect fatally shot two people in Winthrop

Cooper’s son, Gary Cooper Jr, remembered his mother (left and right) as 'caring and selfless' and always ready to help anyone in need.

Flowers and notes left on the fence in Winthrop on Monday, two days after the deadly rampage 

The incident unfolded around 2:45pm Saturday in the city of Winthrop, about six miles outside of Boston, when Allen crashed the stolen box truck into the building. 

He walked away from the crash and shot Cooper in the back multiple times and Green in the head, neck and torso, DA Rollins said.  

When responding officers got to the scene, a Winthrop police sergeant found Cooper and Green on the ground with gunshot wounds, quickly identified and confronted Allen, and shot him, police said.  

Rollins said the police sergeant followed protocol by telling Allen to drop the gun before shooting him and then 'immediately rendered' aid.   Allen died shortly afterwards. 

'This Police Sergeant, like Trooper Green and Staff Sergeant Cooper, is a hero,' Rollins said on Sunday. 'The Sergeant stopped a volatile and escalating situation, saving lives, and protecting the community he serves.'

Green retired from the state police in 2016 after nearly 40 years in law enforcement. He also served in the Air Force. Cooper, is survived by her son, two grandchildren, and her twin sister

The Winthrop police sergeant who shot the gunman was placed on administrative leave, as part of standard protocol. 

Rollins said police found the 'troubling' racist literature but didn't say where they were found or go into any other details about them, but said, 'There is a growing national, and global, problem with extremism and white supremacy.

'The FBI believes the most serious domestic violent extremist threat comes from "racially or ethnically motivated violent extremists, specifically those who advocated for the superiority of the white race."' 

Winthrop Police Chief Terence Delehanty told Masslive.com, 'We have no tolerance for hate in this community.'

Medics wheel a gurney toward the scene after two people were shot in suburban Boston

Police secure the scene after a large truck crashed and shots were fired

Massachusetts state police told Fox News that Green was the 'quintessential professional' and are trying to determine if attempted to confront the suspect. 

'As the investigation continues and resources are extended to the victims’ loved ones and to the Winthrop community, we must say loud and clear that hate has no place in our communities or our nation,' Rollins tweeted on Sunday.