WASHINGTON (BRAIN) — Longtime retailer Charlie McCormick, the founder and CEO of City Bikes in D.C., died of natural causes on May 11 while camping in a remote spot overlooking the Potomac River in Poolesville, Maryland.He was 60.For more than 30 years, McCormick ran City Bikes. Along with the sister store ElectriCity Bikes in the Tenleytown neighborhood of Washington, both