A Murder in Kalamark

On April 14th, 2004 - Roger Lindberg and his brother Sune were attacked in their home in Kalamark, Sweden. Sune survived while Roger did not. Within days the local police zeroed in on their suspect who was identified as Kaj Linna. He was charged and found guilty of the crime. Then, out of nowhere a Swedish podcast picked up the case and found that Kaj might have been wrongfully convicted and it turns out that he was. Kaj was released from prison after serving 13 years. But that still leaves the question, who killed Roger Lindberg?