Crenshaw was killed the same day a trial had been scheduled to begin in the robbery case. A prosecutor says there had been bad blood between the two men and Crenshaw allegedly had robbed Matthews at gunpoint sometime before the shooting.
Matthews and 17 other people also are charged with being part of a cocaine network that operated out of an Allentown barbershop.
Officials say Matthews faces a maximum of 40 years in prison when sentenced on Jan. 5 in Lehigh County Court.
Information from: The Morning Call, http://www.mcall.com