A 16-year-old girl was killed in a sledding accident in Texas that has left another teenage girl in "critical condition," according to police. Two 16-year-old girls were found with life-threatening injuries after they were riding on a sled tied to a Jeep Wrangler, which was being driven by a 16-year-old boy in Frisco on Sunday, January 25, the Frisco Police Department said in a news release issued that day. "Witnesses reported the sled struck a curb and collided with a tree," police said.