Sanna Riitta Liisa Sillanpää (born 15 April 1968) is a Finnish woman who shot three men to death with a rented 9mm Beretta 92FS semi-automatic pistol[1] on 21 February 1999 in a shooting range in Albertinkatu [fi], Helsinki, and wounded another man, who received lifetime injuries.
[3] In mental health examinations Sillanpää was found to have schizophrenia,[2] and had a delusion of being the widow of an agent of the Federal Bureau of Investigation, whose death she had to avenge.
She appeared to be a fan of The X-Files, and the police investigated the possibility of the series having a plot line similar to Sillanpää's actions, although nothing of the sort was found.
[3] In district court, the state prosecutor Maarit Loimukoski demanded Sillanpää to be imprisoned for three acts of manslaughter without full understanding (partially insane) and two attempted acts of manslaughter, but on 11 October 1999, the district court deemed Sillanpää legally insane.
[4] Sillanpää, 30 years old at the time, has a Master's degree in computer science[5] and is an IT expert who worked for Fujitsu Finland Oy in Helsinki.