Sadly, I've found nothing in swedish media that say what the cause of his death was. But I know that he has had issues with his health for a couple of years.
Man, Bo Hansson was one of my two biggest heroes, a sort of musical father figure and I'm so sad that he has passed. I had hoped to see him live and try to share a few words with him...but...well I'm a bit empty.
Rest in peace Bosse. You left us to early!