Prosecutors said Ethan Kollie purchased the body armor and ammunition that Connor Betts used in his attack.
New video surfaces from shooting that killed 9 in Dayton
New video surfaces from shooting that killed 9 in Dayton; Ohio governor plans to speak
Prosecutors did say however, that there's no indication that Kollie knew about Betts' plans.
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Kollie is charged with lying about being a drug user when he purchased his own gun.
His attorney said his client was as shocked as anyone by the massacre.
Vigil held to honor 9 victims killed in Dayton mass shooting
Vigil held to honor 9 victims killed in Dayton mass shooting