He's a Dutch psychokiller vegan animal rights activist... he killed a couple of people, most famously Pim Fortuyn.
Volkert Van der Graaf - Vegan Assassin and Murderer
Volkert van der Graaf's extra-legal activities as an animal rights activist include at least two murders. Volkert is the assassin of Pim Fortuyn. He shot Fortuyn on 6 May 2002, at 18:00 hours in Hilversum, The Netherlands.
He is also the sole suspect in the murder of Chris van der Werken, a civil servant responsible for environmental policy in the North Veluwe, an agricultural part of the country, where both Volkert and van der Werken used to live and work. Like Fortuyn, Chris van der Werken was shot in the back by the perpetually angry, cowardly van der Graaf.
Volkert was also a member of a group called the "Furious Potatoes" (De Ziedende Bintjes), a group that carries out illegal, violent actions against fur breeders, companies that carry out animal tests and firms that operate in a way that they consider environmentally unsound.
Volkert, like most vegans is extremely intolerant of those with an opposing point of view. Intolerant enough to kill them.