This is getting difficult to find, gone from YouTube and most other places, so I post it here.
It is a phone conversation between "Johan Andersson" (granskning sverige) and Robert Aschberg after the death of Bechir Rabani. Robert is trying to arrange a meeting for an on-camera interview but "Johan" keeps asking questions to Robert. When asked about Bechir's death, Robert says "I know how that death happened, but for integrity reasons I will not tell you" (timestamp ~4.30) Probably before he realizes that the conversation is likely recorded by "Johan".
This was at a time when there were no official comments from police about the death of Bechir Rabani other than the fact that he was dead.