A semi-truck struck and killed a pedestrian on Interstate 25 in the Mead area early Saturday morning, closing all southbound lanes between Highway 119 and Highway 66.A semi struck the person around 4:53 a.m. Trooper Sherri Mende z told Denver7.The Colorado State Patrol is investigating how the person came to be on the Interstate, Mendez said.There was no estimate given for how long southbound lanes will remain closed. ...read more read less