he couldn't take his eyes off of me. and i thought, this kid has done something wrong. and he thinks i'm coming to arrest him because i'm approaching him in uniform. >> reporter: did you share that with derek? >> yes. he said, we've received more information now, and we think we have another suspect. >> reporter: another suspect. a new name altogether, based on information from an eyewitness who may have seen annie kasprzak the night she was killed and knew who killed her. coming up -- is this how annie was murdered? and is this the man who murdered her? when "dateline" continues. when "dateline" continues. sourced colors and flavors and are gluten & dairy free. they're all clean. all the time. even if sometimes we're not. sundown vitamins. all clean. all the time.