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CUMMING, Ga. -- More details are emerging about the suspect in Friday's shooting outside of a Forsyth County courthouse.

Dennis Marx was shot and killed after deputies said he drove his car up onto the sidewalk, threw out explosives, and then began shooting through the windshield with an assault rifle.

Ann Shafer, a lawyer who had been representing Marx for the past six months on a drug charge, said her former client was angry with the legal system.

Shafer says the 48-year-old, described as a gun trader, had no criminal history or violent past. He was set for court on Friday to take what Shafer calls a reasonable plea agreement for the drug charge. He never showed up. Forty-five minutes later, as Shafer left the courthouse, she heard gunshots and says Marx came to mind.

"It didn't hit me immediately, but as I drove down the road I began to become concerned," Shafer said.

RAW AUDIO: Courthouse shooting scanner traffic

Marx had taken aim at the Forsyth County Sheriff's Office last year when he filed a federal law suit alleging the department used excessive force and conducted unlawful searches. It appears to have been filed against close to 30 members of the department and with Marx acting as his own attorney.

"I just think he thought he had been done wrong by the police department, law enforcement, judges, lawyers and that no one really understood him," Shafer said.

Shafer said Marx often wore paramilitary clothing when he met with her and says she had asked to be removed from his upcoming case because the relationship had become untenable. She said she's not sure who Marx was aiming for on Friday but is thankful she went out the back door.

A family member who contacted 11Alive stressed that Marx was not a convicted felon. The family member, who spoke on the condition of anonymity, admitted that Marx had marijuana in his possession, but said "he used it to self-medicate."

"He's a working man," the family member saild. "He did not need to sell pot. It was for his personal use because no amount of medication gave him relief."

Marx had numerous injuries from motor vehicle accidents, the family member said.

The family member denied claims that Marx was a gun dealer.

"He was an avid gun collector," the family member said. "He did not deal in weapons."

The family member said Marx had no background in making explosives.

After a search of his home on Friday, investigators did say they found explosives. They said they weren't rigged to explode.

Mary Ellen Mantz said that she lived down the street from Marx for 14 years. She said that he'd been under a lot of stress because of the drug and weapon charges he was facing, but said he continued to help her around the house and yard.

"I can't quite wrap my head around the fact that he's capable of doing what he did this morning," Mantz said. "I just think he must have turned a very dark corner."

Mantz said that Marx supported himself doing odd jobs and yard work for others while he tried to get the charges dismissed.

Marx's 49th birthday would have been next week, the family member said.

RELATED: Deputy praised as hero for stopping courtroom assault

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