A South Jersey man died of his injuries following a motorcycle crash last month. Jason Derby, 50, of Commercial Township, was riding a motorcycle east on Route 767 in the township around 7:30 a.m. May 26 when the vehicle left the roadway and struck two street signs and a tree, according to a New Jersey State Police spokesman. Derby suffered serious injuries, police said, and died the following day. The cause of the crash remains under investigation. Our journalism needs your support. Please subscribe today to NJ.com. Matt Gray may be reached at mgray@njadvancemedia.com.