One person has died and two others were seriously injured in a hit-and-run crash in Highlands Ranch late Monday morning, the Douglas County Sheriff's Office said.The driver suspected in the wreck was reportedly traveling eastbound on E. Wildcat Reserve Parkway when the person went off the road and hit pedestrians on the sidewalk near Willowbridge Way.The Douglas County Sheriff's Office said a witness followed the hit-and-run suspect, helping law…