>> some sort of intruder? >> yeah, someone came in while he was in the shower and shot lisa and got away before he could catch them. >> we'll figure it out. >> lisa's father, todd, thought he had it figured out and already had a suspect. >> go get him, go get him, now. >> todd's rage was directed at the neighbor on the other side of the fence. a 56-year-old army veteran, named tate. >> i thought they better get to him before i do. >> reporter: ryan tate was embroiled in an escalating feud with his neighbors. todd knew about it and was certain his daughter was dead because of it. the culmination of bad blood? >> right. >> reporter: started about two months before the murder. seth pulled a dead deer off the property line.