or a dead end? hard to know. so burbridge and his team of investigators kept working other leads. and christmas happened. sort of. >> it was really a rough christmas. i look back on pictures. we had smiles on our faces but you weren't really smiling. and my mom, it was so hard to watch her. she wanted to give the grandkids gifts but she was almost like a zombie. you can't not have christmas, you know, but nobody felt like it. >> but grief wasn't all the family was feeling. the debilitating fear took hold, too. whoever killed their patriarch might not be done. >> we armed ourselves. i spent about $10,000 on a security camera system around the house. went out and bought an attack dog, german shepherd. >> meanwhile detectives hit the road and that's when they discovered something truly shocking. doug carlile wasn't the only victim of the weird goings on