I'm not convinced that she planned to go biking. Seems like a cold windy day for a bike ride ... 64 F, 20 mph winds gusting to 27 mph. I remember thinking at the time that a bike ride was surprising.
Hiding some biking clothing seems like part of the ruse that she was biking, and very useful when he wanted her body to be found and identified. Barry is the only source for a planned bike ride, and he immediately pointed investigators in the direction of a missing bike, missing bike helmet, and disappearance away from the house.
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