i did not feel -- i felt there was something wrong here. just -- >> reporter: why? >> cop intuition i guess is -- >> reporter: that -- >> -- what it was. >> reporter: that maybe this isn't medical. >> that yeah, there was something more to it. it just seemed that way. >> reporter: his instinct proved right. still, he didn't expect what came next inside the home of tom and kelley clayton. this is footage from the body camera swan was wearing that night. he arrived to find a man outside coming towards him. it was a neighbor. >> hi, how you doing? >> i'm okay. >> what's going on? >> tom just came. i'm the neighbor. tom just came over and got me out of bed. >> why? >> there's -- he's right in the house. he's -- >> okay, what happened though? >> his wife is in there. >> i went in, located mr. clayton. and he was kind of down on his knees. kind of bobbing up and down, visibly upset and in the hallway between the hallway and the transition area between the hallway and the dining room. >> anybody else in the house, tom? just you? >> oh, my god the kids are at the neighbor's house. >> i say, "where's your wife?" and he pointed to the kitchen area. and that is when i walked around and i located the victim on the kitchen floor.