DENVER -- The man suspected of shooting and killing a uniformed RTD contract security officer in Lower Downtown late Tuesday night has been described as a "radical Muslim," law enforcement sources told FOX31 Denver.

The suspect was identified as 37-year-old Joshua Cummings.

Two sources told FOX31 Denver that investigators found jihadist materials in Cummings' backpack and those materials are now being investigated.

Scott Von Lanken, 56, was shot and killed, http://kdvr.com/2017/02/01/man-fatally-shot-in-lower-downtown-denver/