The man, who is in his 40s, has been in custody since November.
It was in mid-November that two children were found seriously injured in connection with an apartment building in Hässelby in western Stockholm.
One of the children died of his injuries.
The father has previously admitted that he stabbed the children.
Hear the prosecutor tell about the case in connection with the man being arrested in the video below.
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The father in Hässelby is arrested - hear the prosecutor Maria Franzén.
Photo: SVT & Christine Olsson / TT