Under Michigan state law, criminal suspects must be charged within 72 hours of their arrest.
Woll, 40, was found stabbed to death in her home in Detroit’s Lafayette Park neighbourhood on 21 October.
The killing of the Isaac Agree Downtown Synagogue president shocked the local community and city officials, who remembered her as a beacon of light in the community who tried to build bridges between Jews and Muslims.
Ms Kriger did not immediately respond to a request for comment by The Independent. Detroit police are yet to confirm his release, and did not respond to a request for comment on Saturday morning.
Announcing the suspect’s arrest on 8 November, Detroit Police Chief James White said it was “an encouraging development”.
Chief White added that the arrest “did not represent the conclusion of our work in this case”.
Police have kept the suspect’s identity and other information relating to the investigation confidential.
According to the Detroit Free Press, the suspect knew Woll and attended her funeral.
Police have previously said they had no evidence to suggest the murder was an antisemitic hate crime.