not that i know of. i don t want you dead next. i don t think michael knows. unless he owes money from the past, i don t think he owes any money now. reporter: to edmunds, becky sounded like a mom unwilling or unable to wrap her head around the possibility of her son s involvement in a murder. i think he s trying to stay away from all of that to get out to better himself. reporter: edmunds spun through the possibilities was becky in denial? was she covering up for her son? or was he heading down the wrong path with michael altogether. he decided to cast a wider net. is there some any relationships you re not telling us about? like? you haven t had any problems with anybody? no, nobody. family problems? reporter: that s when becky revealed an intimate detail from her recent past. she and her husband tony had gone through a rough patch in their marriage.
but to this veteran cop, david s emotions seemed real. and in the end, edmunds had no reason to believe that david played any role in a plot to kill kay. we had no evidence whatsoever to prove that he knew or was involved in any of this. i really don t wanna come have to come back, you know? come back to you with somethin else that comes out that you haven t told me. you know what i m saying? oh, well, you can ask me anything. i don t know what else you need to hear from me. i m not tryin to keep anything from you guys. i promise. reporter: before edmunds turned off his recorder, david did share one tidbit. something that linked up with what becky s brother had told edmunds earlier. it was the name of the other person becky had confided in about her affair with david. becky s son, chris. i asked her who knew. you know, who else knew. and she did tell me that christopher knew that she was with somebody else. i don t know if that means anything or not. reporter: sheriff s
reporter: kay and becky even joined weight watchers together. and the two of them were pretty competitive at the weight watcher thing, huh? yes, yes. reporter: who s up a pound, who s down a pound? yes. every day. reporter: and one day in march, 2009, began like any other. kay, the little league mom, got up to take derek to school, and becky, the mother of five, left her house a few minutes later to drop off her kids before her work day began. all very routine. until 8:30 a.m., when contractor mitch cozart showed up to do some maintenance work on kay s back door. you re coming around the corner. you lift up the latch gate. and tell me what you see. okay. when i walked back into the into where the back door was, it was the glass was busted out. and i i immediately knew they had been broken into. reporter: did you put your head inside the house and look around or call all i did reporter: call out her name. i just i just stuck my head just inside just
reporter: so many terrible things happened so quickly. so many taboos were broken on an anywhere suburban street that the mind reeled. we were so confused. we just kept praying for the families. the whole neighborhood was shocked. reporter: it began here with two houses, two best friends on a street called hot springs drive in grovetown. kay parsons had moved into the neighborhood in 2005. she was a devoted wife to her husband, david, who worked down at ft. gordon. and an active little league mom cheering on her 12-year-old son derek. tamara lived just down the street. kay was a sweetheart. you never saw her upset, never saw her mad, always smiling, just a joy to be around. what kinds of things did she like to do? well, mostly anything dealing with her son and her husband. she was very supportive, always being with them. reporter: next door to kay lived becky sears. becky had her hands full, too.
there. reporter: then from the hospital, the news everyone feared and expected. doctors determined kay s injuries were too severe for her to make it. the family decided to take her off life support. kay parsons, devoted wife to david, loving mother to derek, was gone. and so then they let me know that she had passed away. you lost your friend, kay. yes. yep. a beating death, a break-in. yes. how horrible is this for you, suzanne? one of the worst days of my life. i didn t expect it. 41 years old. i mean, you can see somebody dying of cancer or, you know, in a car wreck or something like that, but to be beaten beyond anything. did you go back? yeah. yeah. you said goodbye to kay? as much as i could. reporter: now the stakes quickly became much higher for this investigation. kay parsons had been murdered. and edmunds started thinking this killer might just be someone who knew both women, becky and kay. someone who had been right there at the scene of the crime. co