Yes, this possibility has been teased many times before. On top of my head - Arrest of "33-åringen" days after the murder - Gert Fylking's article about Christe

Yes, this possibility has been teased many times before. On top of my head - Arrest of "33-åringen" days after the murder - Gert Fylking's article about Christer Petterssons admission to him - Pelle Svensson about "bombmannens testamente"