The Georgia man who killed two in attacks that were described as 'pure evil' is actually from Britain and became a US citizen under Joe Biden's administration, the Department of Homeland Security (DHS) said.

Olaolukitan Adon Abel, 26, is accused of murdering two people and injuring a third in a series of heinous gun attacks across DeKalb County in Georgia, which includes about 10 percent of Atlanta.

One of the people killed by Abel was DHS employee Lauren Bullis, 40, DHS Secretary Markwayne Mullin wrote on X.

Abel is accused of shooting and stabbing Bullis while she was out walking her dog.

'Since President Trump took office, USCIS has implemented measures to ensure individuals with criminal histories and who otherwise lack good moral character do not attain citizenship,' Mullin wrote Wednesday.

Abel's arrest was also related to the murder of an unidentified woman shot outside a Checkers, Mullin said.

He then 'randomly' shot a homeless man multiple times outside a Kroger grocery store in Brookhaven.

Abel's lengthy criminal record included convictions for sexual battery, battery against a police officer, obstruction, assault with a deadly weapon and vandalism, Mullin added.

'These acts of pure evil have devastated our Department and my prayers are with the families of the victims,' Mullin wrote.

A spokesperson for the DHS told the Daily Mail on Wednesday that Bullis 'approached her work with integrity, thoughtfulness, and a commitment to excellence that strengthened our organization and the communities we serve.'

Bullis had worked in the DHS Office of the Inspector General in multiple roles, including as an auditor in the Office of Audits and as a team leader in the Office of Innovation.

'Beyond her professional accomplishments, Lauren was a bright spot for so many of the DHS community,' the DHS added. 'She brought warmth, kindness, and a genuine sense of care to her colleagues each day.'

She was found dead around 6.50am on Monday in Battle Forrest Drive near Decatur, about 20 minutes east of Atlanta, according to the DeKalb County Police Department.

Bullis would regularly walk her dog along that route, according to neighbors, who said that several gunshots had been heard between 6.30 and 7am.

'It was a lady laying down and a man over her, so I'm running,' Tiffany Williams, a neighbor, told FOX 5.

Williams added that the man had taken off 'going up the street' after the fatal attack.

A GoFundMe has been launched to help support Bullis' husband Jimmie after her killing. As of Wednesday, about $11,200 had been raised from an initial $18,000 goal. 

Authorities have alleged that Abel fired shots twice early Monday morning, before killing Bullis.

The DeKalb County Police Department first found a woman, whose name has not been released by law enforcement, suffering from multiple gunshot wounds outside the Checkers on Wesley Chapel Road in Decatur around 12.52am.

She was rushed to a local hospital, where she succumbed to her injuries.

The DeKalb County Police Department told the Daily Mail that next of kin notification was still pending in relation to this killing.

About an hour after the shooting, Abel drove up in a vehicle to Cherokee Plaza at 3855 Peachtree Road in Atlanta and shot a 49-year-old homeless man multiple times, according to the Brookhaven Police Department.

Law enforcement quickly responded to a 911 call and found the man suffering from multiple gunshot wounds.

He was taken to the hospital in critical condition, and his identity has not been released.

'Our thoughts and prayers go out to him and his family as he fights to recover from this incident that occurred,' said Brandon Gurley, the Brookhaven Police Chief.

Abel's silver Volkswagen Jetta was tracked using surveillance cameras and the Georgia Department of Public Safety arrested him during a felony traffic stop.

Although the three attacks happened within a matter of hours, the motive is still unknown and being investigated.

In total, Abel has been charged with two counts of malice murder, aggravated assault, possession of a firearm during the commission of a felony and possession of a firearm by a convicted felon.

He was supposed to appear in court on Tuesday but he waived his appearance, WSB-TV reported. 

Chatham County court records previously showed that a 26-year-old man by Olaolukitan's name had been arrested last April for inappropriately grabbing four women, FOX 5 reported.

He was sentenced to 120 days in jail and 36 months' probation that September, while also being required to receive a mental health evaluation.

As a result, Olaolukitan had been charged with four counts of sexual battery and obstruction of an officer, which are all misdemeanors.

The Daily Mail has reached out to the Brookhaven Police Department for further comment.