Authorities are picking up the pieces after Wednesday's shooting at the Holocaust Museum in Washington, DC.
A portrait is also beginning to emerge of the alleged shooter.
James Von Brunn's Web site and writings portrayed a man on the edge -- consumed with anti-Semitic and anti-black hatred.
The 88-year-old's decision to act out on his obsessions was the culmination of years of white supremacist rants, according to his ex-wife.
She says "he wanted to go out with his boots on -- like John Wayne."
Just before 1 p.m., he stepped into the Holocaust Museum and began firing a 100-year-old rifle.
"This lady came running and crying and saying, 'Run! Run! There's a shooter! There's a shooter!" a witness said.
Security guards immediately confronted Von Brunn. He was shot and critically wounded, but not before fatally shooting one of the guards, Stephen Tyrone Johns. As a result, a young boy is left fatherless.
"He was a loving father. And he was also my hero," Johns' son said.
There were previous indications of Von Brunn's instability. In 1981, he stormed the Federal Reserve building in Washington and attempted to make a "citizen's arrest" of board members. Although Von Brunn was armed, no one was injured.
According to Von Brunn's Web site, he served six and a half years in prison for that incident.
The Holocaust Museum is closed Thursday, as workers mourn the death of Johns and authorities continue to assess the threat posed by lone wolf terrorists like Von Brunn.