Sture Ragnar Bergwall (born 26 April 1950), also known as Thomas Quick from 1993–2002, is a Swedish man previously believed to have been a serial killer, having confessed to more than 30 murders while detained in a mental institution for personality disorders. Between 1994 and 2001, Quick was convicted of eight of these murders. However, he withdrew all of his confessions in 2008. As a result, his murder convictions were quashed, the final one in July 2013, and he was released from hospital.
https://en.wikipedia.org/wiki/Sture_Bergwall