they're havin' phone sex for an hour. >> reporter: then the next morning right around the time of kay's murder david called becky again. this time because he said was worried about kay. >> is it weird that the husband should be calling the mistress? >> oh, definitely to check on his wife. >> asking her to look in on his wife? >> you know, i -- >> what's up with that? >> that's what i'm thinking. i mean, is he calling to say, "hey, is it done," you know? >> you gotta wonder, right? >> oh, definitely. >> are these two in cahoots? >> most definitely. >> you guys gotta believe me. this is the last thing so far from the last thing i wanted. to take her and all that away from my son. away from her family and all of her friends. >> reporter: throughout the interview, david repeatedly denied having any involvement in kay's murder or being a part of some plot to have her killed. >> never once has there been any kind of insinuation, not even insinuating that i would ever want anything to happen to her. >> reporter: as for those repeated calls from california the morning of the murder, david insisted he was genuinely concerned about kay.