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He -- he had an alibi. there was no way he could be 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 someb...

Baseball bat. >> so the way the weapons the appeared just describe a horrendous attack? >> yes, it appeared that this -- this hammer, you know, was used in - - in, there was so much blood, it -- it slipped outta the attacker's hand. and, you know, the baseball bat, which we were able to determine belonged at that house, was -- was a weapon of opportunity after he lost the first weapon. >> reporter: it looked like the little league mom was beaten with her own son derek's baseball bat. >> it really touched my soul knowing how much derek loved baseball. and i'm, like, "how in the world could some...

He's like, "she just needs kay out of her life bad." you know? stuff like that. >> reporter: now that was a shocker. investigators had had their eye on becky's other son michael from the get-go. >> i was surprised to hear it that way. i was surprised to hear that it was michael, really 'cause, you know, i've been learning so many things about michael and -- and his past and all of that. >> you haven't had any discussions with michael about -- like you've had with -- with christopher? >> not like with christopher, no. no. 'cause me and christopher are a little bit closer than me and michael. >>...

>> 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. >> ...

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 record...