but, lea thought something didn't seem quite right. >> she would text them at all different times about things. i didn't like that. i didn't think it was professional. we disagreed about him communicating with her. i think he saw the need of somebody, both herself and her child who couldn't protect themselves. he felt like he needed to help. >> something weldon had done all his life. lea could understand that. what's she could not understand was what came next. >> hello this is 9-1-1. >> hi my friend has just been shot. can you call an ambulance? >> yeah we have the paramedics. they're on route now okay? >> a sniper waiting in the dark, but who was the target? >> coming up. >> they're hearing multiple bullets, multiple rounds whizzing past their heads. >> did they find the shooter? >> no, he just vanished. >> vanished. >> when dateline continues.