The Hunt for a Killer - Season 1 Episode 5 -

Pelle secretly and against his boss' will sends DNA from Helen to a lab in Birmingham for analysis. Now Pelle is in a hurry. This is the last chance, then the investigation will be closed forever. The prosecutor gives Pelle the go-ahead to top a number of DNA suspects. As the last name on the list, Monica gets through that Ulf Olsson will be topped. Name after name is excluded but they finally get a hit.