The 30-year-old man is a resident of Norrköping and has, by the prosecutors who prosecuted him, been described as a leader and as the one who planned the murders.
Now the same man is arrested on suspicion of having prepared another murder - with connection to Skåne.
- We have interviewed him.
He also denies crime in our investigation, says prosecutor Per-Axel Rosén Beck to the news agency Siren.
Has contact with Norrköping
The prosecutor does not want to go further into the suspicions in the case, but says that the preliminary investigation did not start due to any information discovered in the murder investigations in Östergötland.
- The investigation was already initiated when we established contact with Norrköping, because we have of course done so, he says to the news agency.
Encrochat part of investigation
The encrypted chat tool Encrochat also plays a major role in the case in Skåne.
- But exactly at what stage it has come in or what significance it has, I do not want to comment at the moment, says Per-Axel Rosén-Beck.
The man has been in custody in Norrköping since July last year.
The new detention center in Helsingborg is a so-called conditional detention.
This means that if the man is released on bail in connection with the process in Norrköping, he will still return to prison.
When charges were brought in the Norrköping murders, investigators commented on the case as follows:
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Lars-Inge Olsson, head of investigation for serious crimes in Norrköping.
Photo: Axel Brantemo / SVT.