Sam yes possible, on a practical level it is quite hard (not sure if possible) to open a Cirrus door in flight to allow access out, you could I guess more easily remove / smash a window to vacate the aircraft.
However unlikely or far fetched this would seem I am very sure it would not be a first in GA.
My bet however is a regular loss of control but as previously pointed out could be a 100 different hypothetical reasons.
Still very strange wording of the police force which inevitably would create speculation.