He was shot and killed by police moments before entering a bar packed with people, many of whom had taken shelter from the street.
His sister, Megan Betts, 22, was one of the first victims to be killed.
"There is no evidence and no allegation. that Kollie intentionally participated in the planning" of the August 4 shooting, he said.
According to the criminal complaint, Kollie stored the items in his apartment "to assist [the gunman] in hiding them from [the gunman's] parents".
A message seeking comment was left at a phone number for Kollie.
Federal authorities say the friend of the OH shooter bought him body armor and a firearm accessory earlier this year.
Betts, 24, opened fire with a.223 rifle in Dayton's Oregon District killing nine and injuring dozens more.
Two Ohio lawmakers have reintroduced legislation restricting access to guns following the Dayton mass shooting.
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One bill would require background checks on all firearms transactions.
The second bill raises the minimum age for all gun purchases to 21.
Lehner also now backs a Democrat-sponsored "red flag" bill creating a process for removing guns from someone who poses an imminent danger to themselves or others.
U.S. Attorney Benjamin Glassman charged Betts' friend Ethan Kollie with making a false statement regarding firearms.
Just days after the shooting, Ohio Republican Gov. Mike DeWine announced a package of gun control measures, including requiring background checks for almost all gun sales in Ohio and allowing courts to restrict firearms access for people perceived as threats.
Federal officials said Kollie told authorities that in addition to smoking marijuana regularly, he used "hard drugs", including acid, sometimes with Betts, authorities say.
According to the affidavit, Kollie also acknowledged purchasing three items for the Dayton shooter: body armor, an upper receiver that was attached to the AM-15 weapon and a 100-round double drum magazine.
Federal officials announced charges Monday stemming from their investigation into the deadly shooting in Dayton last Sunday morning. The 24-year-old Connor Betts opened fire in a popular entertainment district, killing his sister and eight others.