The man who worked security for Rep. Jasmine Crockett, D-Texas, but was killed in a standoff with SWAT last week was accused of impersonating a police officer and other offenses, although the congresswoman is defending him, saying his criminal history does not include any violent offenses.

The suspect, who was identified as Diamon-Mazairre Robinson, 39, was shot and killed by Dallas Police SWAT officers on Wednesday. He had barricaded himself inside a vehicle in the garage of a children's hospital after Dallas Police officers tracked him while investigating an active warrant.

Police deployed tear gas to force him out before the suspect exited the vehicle and pointed a gun at officers, leading officers to shoot him. The suspect did not fire his gun, and no officers were injured.

Dash camera footage of the incident at Children’s Medical Center Dallas was released on Monday.

JASMINE CROCKETT'S ALLEGED SECURITY GUARD KILLED IN STANDOFF WITH DALLAS SWAT TEAM: REPORTS

He was wanted for impersonating a law enforcement officer and had claimed to be one while recruiting for his business that placed off-duty officers in security jobs.

Robinson was driving a replica undercover car with stolen U.S. government plates, often wore fake police uniforms pretending he was a federal agent and created a fraudulent business where he used fake identifying information to hire legitimate police officers for off-duty jobs. Dallas Police also said 11 firearms were recovered during their investigation, including the handgun he was holding during the shooting, which was reported stolen. 

He was also not using his real name, going by the alias "Mike King."

"The agencies that he reported to work for do not exist. So dignitaries, basically special dignitary police, that agency does not exist within the federal government. So that's who he portrayed to be. There was no actual federal agency that he worked for that existed. He was very good at hiding his true identity … He had been living like this for many years," Dallas Deputy Police Chief William Griffith said on Monday.

Robinson has a lengthy criminal history, with arrests going back as far as 2010. He has been charged with offenses such as theft and violating probation.

Crockett came to the defense of her former security guard, releasing a statement on Monday saying her office was unable to find any violent offenses in his "limited criminal history."

"We are saddened and shocked by some of the concerning revelations. Our team followed all protocols outlined by the House to contract additional security. We were approved to use this vendor who also provided security services for additional entities in the local community and worked closely with law enforcement agencies including Capitol Police," she said in the statement.

The congresswoman said, "the fact that an individual was able to somehow circumvent the vetting processes for something as sensitive as security for members of Congress highlights the loopholes and shortcomings in many of our systems."

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"This is incredibly alarming, especially for those members who receive high volumes of credible and sophisticated death threats," she said. "This situation reiterates the need for Capitol Police to provide security for members of Congress, especially under this administration's new normal of inciting attacks on those who dare to speak out. We are fortunate that this is someone who used those loopholes without malice. Furthermore, after an initial review of the limited criminal history of Diamon Mazairre Robinson in Dallas County, we've been unable to locate any violent offenses."

The progressive lawmaker added that "there was never any reason to suspect that he wasn't who he held himself out to be," saying he never endangered her team, worked diligently, coordinated with local law enforcement and maintained positive relationships throughout the community."

"What we're now learning about his past doesn't fit the person we came to know as Mike King," she wrote. "His death evokes a range of emotions. Our hearts grieve the loss of someone we knew and the lost good that could have come from his redemption."

Authorities searching for missing retired Air Force Maj. Gen. William "Neil" McCasland are investigating a new development after hiking boots believed to belong to the missing general were discovered at his vacation home, officials said Monday.

Investigators said they are still working to determine whether the boots are connected to McCasland’s disappearance, which has now stretched into a third week.

During a Monday news conference, the Bernalillo County Sheriff’s Office said there have still been no confirmed sightings of the 68-year-old aerospace engineer, and the Silver Alert issued for him remains in effect.

McCasland was last seen leaving his Albuquerque, New Mexico, home on foot around 11 a.m. on Feb. 27, authorities said.

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Investigators noted he left behind his phone, glasses and wearable devices at the house. However, several personal items remain missing, including his wallet, a revolver and a holster for the gun. Investigators also said Monday that a red backpack is unaccounted for.

Earlier that morning, McCasland was seen speaking with a repairman at his home around 9 to 10 a.m., according to authorities.

The repairman described McCasland as being in a "mental fog," but investigators said there was no indication he was disoriented or confused, describing him instead as a "highly intelligent, highly capable" person.

"Out of an abundance of caution, we escalated the search to a Silver Alert with that information that was given to us early on," a Bernalillo County Sheriff’s Office official said.

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Authorities say McCasland vanished within roughly a one-hour window while his wife was out of the house for an appointment.

Search teams have also recovered a U.S. Air Force sweatshirt more than a mile from McCasland’s home, though investigators have not confirmed whether the item belonged to him.

McCasland is described as 5 feet, 11 inches tall with white hair and blue eyes and was last seen wearing a light green, button-up outdoor shirt with two chest pockets.

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Officials believe he left his home on foot.

The retired general is known to be an avid outdoorsman who frequently hikes, runs and cycles in Albuquerque’s Northeast Heights and the nearby Sandia Foothills, where search crews have focused some of their efforts.

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Authorities said they have received dozens of tips and are urging residents to check home security video captured between Feb. 27 and Feb. 28, which investigators say is a critical window in the search.

The FBI joined the search effort on March 3, assisting local authorities as the investigation continues.

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Investigators said they had not uncovered evidence of foul play, though officials have emphasized that no scenarios have been ruled out.

McCasland’s wife, Susan McCasland Wilkerson, has also pushed back on speculation tying his disappearance to his past military work.

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"It is true that when Neil was in the Air Force, he had access to some highly classified programs and information," she wrote in a Facebook post. "He retired from the AF almost 13 years ago and has had only very commonly held clearances since."

Before retiring in 2013, McCasland commanded the Air Force Research Laboratory at Wright-Patterson Air Force Base in Ohio and holds a Ph.D. in aerospace engineering from the Massachusetts Institute of Technology.

Despite online speculation, his wife said he had no special knowledge about extraterrestrials or the Roswell incident.

Authorities are asking anyone with information about McCasland’s whereabouts to text BCSO to 847411 or contact the sheriff’s Missing Persons Unit at 505-468-7070.