SIOUX FALLS, S.D. (KELO) — Authorities said that speed "is a possible factor"and alcohol use is still unknown regarding a deadly motorcycle crash Friday night in central Sioux Falls. On Monday, Sioux Falls Police Sgt. Travis Olsen said the two victims were Erik Boyles, 56, and Travis Gallop, 55, b oth of Sioux Falls. Police said the [...] ...read more read less