ROANOKE, Va. (AP) — Living alone in a world of perceived slights, Vester Lee Flanagan II festered and fumed. His hair-trigger temper directed at a random collection of people he encountered never seemed to stray into the type of violent behavior that would have put him on the radar of police or mental health professionals.
By not crossing that line, he avoided doing anything that would have made it illegal for him to purchase the gun he used to kill two former co-workers on live TV in Virginia.
Flanagan, 41, had never been arrested for a felony and had no criminal record. There are no records indicating he was ever committed for psychiatric care or had been the subject of a restraining order. Hop-scotching around the country for work, he rarely stayed anywhere longer than a year and didn't appear to socialize much. The people on the receiving end of his anger shifted from day to day.
Instead, he left lasting impressions of a man who lashed out at others for imagined offenses. He lived alone in an apartment near the TV station that had fired him two years ago, across the country from his family and California hometown.
How can anyone stop a massacre when no one seems to be close enough to notice hints of looming violence?
"We all wish we could predict human behavior accurately all the time," said Clint Van Zandt, a former FBI behavioral profiler. "The behavior doesn't cross the line until he shows he presents a realistic, immediate threat to himself and others."
Flanagan fatally shot himself while fleeing police and can't explain why he killed WDBJ-TV reporter Alison Parker, 24, and 27-year-old cameraman Adam Ward. In a fax to ABC News, Flanagan wrote that he had been mistreated for being black and gay, and the "tipping point" was the shooting that killed nine black people at a church in Charleston, South Carolina, in June.
In his last hours before shooting himself to death, Flanagan — using his on-air name, Bryce Williams — posted a grisly video of himself killing Parker and Wade and sent a series of tweets complaining about the two, who often worked together on the station's morning show. Of Parker, an intern when he was at the station ahead of his February 2013 firing, he complained she had made racist comments; of Ward, he claimed the cameraman went to the station's HR department after working with him just a single time.
Investigators who reviewed evidence and interviewed Flanagan's family, associates and former colleagues concluded that he "acted alone and shared his plans with no one," the Franklin County Sheriff's Office said.
Bureau of Alcohol, Tobacco, Firearms and Explosives spokesman Thomas Faison said Flanagan legally purchased the gun used in the slaying that also wounded a local economic development official, something that couldn't have happened if he had prior felony convictions or a history of mental health commitments.
It's unclear whether Flanagan had ever been treated for psychiatric problems. The people he encountered described him as unstable and with a hair-trigger temper, but no one has said he made threatening remarks.
Justin McLeod, who worked as reporter at WDBJ for a time with Flanagan, described him as having a "Jekyll and Hyde" personality. He was a volatile man who had trouble making friends and would get angry at the slightest perceived insult, McLeod said.
"It was something that was truly scary," McLeod said.
He stayed in Roanoke after being fired and would occasionally be seen around town. Video obtained by NBC News shows a sparsely decorated apartment and a refrigerator plastered with photos of himself, including old class pictures and modeling shots that he also posted on social media.
Police were called to escort Flanagan from the station when he was fired because he refused to leave, but he was never charged with a crime. Flanagan, who was black, yelled a racial epithet and threw a cap as he exited. He pressed a wooden cross into his news director's hand, telling him: "You'll need this." Roanoke police said in a statement Friday that Flanagan sat in his personal car until he received paperwork about his dismissal, then left without problems.
He encountered police on two occasions after that. In 2014, a friend who tried to reach Flanagan by cellphone became concerned he took too much medication and asked authorities to check on him. Flanagan assured officers he was OK, said Roanoke police spokesman Scott Leamon. Then, in December, police questioned Flanagan after he asked his bank to refund money he said had been withdrawn from his account through unauthorized ATM transactions. No one was charged and the money was refunded.
Mark Sichel, a New York-based psychotherapist and author, said Flanagan was a classic "injustice collector," a person whose fragile ego leads to paranoid behavior, such as overreacting to perceived slights and creating enemy lists, as a protective mechanism.
It usually doesn't lead to physical violence, but as the list grows, so does the person's rage and sense of moral superiority, Sichel said. Intervention rarely works, as such a person scoffs at therapy and rejects offers of help. These people tend to alienate people they know, but their behavior tends to be dismissed unless they threaten or harm someone.
"They could call the police and say this person is a danger to others, but I'm not sure the police could do anything," Sichel said.
Sichel said Adam Lanza, who killed 27 people, including 20 students at Sandy Hook Elementary School, in Newtown, Connecticut, in 2012, fit the profile. The phrase "injustice collector" also appears in an FBI report on threat assessments prepared in response to the 1999 Columbine High School massacre in Littleton, Colorado, perpetrated by teenage gunmen Eric Harris and Dylan Klebold.
Others crossed Flanagan in seemingly mundane incidents after his firing. In one instance, he wrote a rambling letter to a restaurant, complaining that staff told him "have a nice day" instead of "thank you." In another, a co-worker at a health insurance company's call center, Michelle Kibodeaux, 46, said he tried to grab her after she made an innocuous remark about him being unusually quiet one day.
"He said, 'Don't you walk away from me. Don't you turn your back on me,'" she recalled.
"I said, 'This is not going to happen'. And he said, 'Don't you ever speak to me again," Kibodeaux said.
His history of workplace disagreements kept him from getting at least one job. Adam Henning, news director at WAFF-TV in Huntsville, Alabama, said he declined to hire Flanagan in 2011 after checking with people Henning knew at least one other station where Flanagan had worked. Henning said he never spoke to Flanagan personally.
Companies often want to know the chances an employee will react violently after being fired, but there is no easy answer because it can take years for anger to reach a boiling point, said Van Zandt, who now works as a consultant.
Chris Hurst, a WDBJ-TV anchor who was Parker's boyfriend, said he and his colleagues wondered in hindsight if there wasn't more they could have done for Flanagan "to extend him love."
"But he needed, at the time, to be pushed away, because he was not someone who was helping our station and helping our newsroom," Hurst said. "But I wonder if I had said the right combination of words to him whether that might have tried to light a spark of change."
Reeves reported from Birmingham, Alabama. Associated Press writers Larry O'Dell in Richmond, Virginia; Holbrook Mohr in Jackson, Mississippi; and Allen Breed in Roanoke contributed to this report.