Her half brother
I didn't get this guy. I didn't understand his motivation for wanting to kill Lisbeth (especially after her father had died) and all the other people he killed. Was he just a psychopathic murderer who did it for fun?
shareDag and Mia were getting close to exposing Zala.
Bjurman knew too much.
His father most likely ingrained in his head a hate for Lisbeth, and he was also embarrassed that he ran away when she was in the barn at the end of Played with Fire.