He is part of the police's cold case group - a group of four police officers who usually investigate serious crimes in Västmanland.
The old murder investigations must be reviewed at the same time as the current crimes are investigated.
- The warm falls completely rain over us, so it will be crowded, but we will make an attempt, says Ove Dahlberg.
He has just received the boxes from Västerås, full of interrogations and evidence, and will make an assessment as to which ones have the greatest chance of being solved.
In the clip, you can see the entire list of cold cases and hear more about the unsolved murders that occurred in Västmanland.