york affiliate wgrz. we ll have more on the protests in the next half hour and the debate whether the u.s. is turning into a police state. don t miss that. now the conductor on an amtrak train is one of four people stabbed while traveling from chicago to michigan. no one was killed in friday s incident, but the condition of the victim is unknown right now. reports say the suspect is a 44-year-old man from michigan. i heard somebody screaming and yelling, just loud noises yelling. i look up and there s an african-american gentleman standing over somebody who is sitting down in one of the first seats in the car, and i ve seen him have his fist up and i bring it down. the investigation on that story is still ongoing. still to come on cnn, rolling stone has backed off its college rape story, saying the accuser s story has crumbled.
but when 29-year-old sergeant james hackemer came home in 2008, he lost both his legs in roadside bomb attack. this chance to come home has been a miracle. reporter: he had been working to rebuild his life as a son, husband and father of two. his family was profiled by nbc s buffalo affiliate wgrz shortly after he was injured. he loved life. he really loved his family. reporter: following years of rehabilitation, hammer went friday to the dereon lake amusement park about 30 miles outside buffalo with friends and family. he wanted to try the ride of steel and climbed into the front seat. the roller coaster reaches a feet of 208 feet and speeds topping 70 miles per hour. after coming off one of the steep, sharp hills, hack merp was thrown from the ride. as far as we know there was nothing mechanicalwise that would have caused the accident.