 Authorities in Sioux Falls are investigating a fatal crash that occurred around 9 p.m. Saturday at East 57th Street and South Reitliff Avenue. Emergency crews responded to the scene where a motorcycle had collided with a car, resulting in critical injuries to the male motorcycle driver. Despite life-saving efforts, the driver succumbed to his injuries at the scene. Preliminary investigations indicate that the motorcycle was traveling at a high speed east on 57th Street when it collided with a black sedan entering the intersection.