After his release, he lured numerous children to his cabin in Vihti where he would offer them alcoholic beverages, bathe with them in his sauna (whilst he was naked and they remained clothed) and play video games with them.

[3] On 3 March, 1989, Siltavuori lured two 8-year-old girls, Päivi-Maria Hopiavuori and Tanja Johanna Pirinen, from their homes in Myllypuro to his car where he then drove to his cottage in Vihti.

He first murdered Pirinen by giving her a lethal dose of pentobarbital before strangling Hopiavuori to death, eventually setting fire to their bodies by putting them in barrels and dousing them with gasoline, neighbours to the cottage witnessed Siltavuori burning the bodies but mistook the remains as trash.

[2] After burning their bodies, he packed the remains of the fire in the trunk of his Ford Granada and drove back to Helsinki.

The involuntary commitment was reaffirmed in 2007 by the administrative court of Kuopio, on the basis that if he was released, he would be a serious security risk.

[5] The murders led to widespread media publicity, during which hundreds of letters to the editor were written about Siltavuori.

An interview with Siltavuori was published in the April 1991 issue of Rikosposti, in which he said that he believed he was the most hated person in Finland.