did someone close to shirley carter want her dead? e led investigators to believe her killer knew where bill stored his weapons. shirley's loved one was were under scrutiny, and soon detectives would discover that someone in the carter clan had plenty to hide. continuing with our story, here's dennis murphy with "the farm. " >> shirley, the farm wife and mother, had been gunned down in her own kitchen and there was no obvious explanation for the crime. as investigators began digging into the carter family background, though, they came across a detail that became the focus of investigation. it concerned the son jason. the one who'd found his mother's body. >> we found out jason carter was having an affair. >> how had you find that out? >> a friend during the interviews. >> so who's this girlfriend? >> we locate her, we bring her in and we determine there's another phone in play. >> another phone? >> a phone that they just had. >> the lovers had, what they call burner phones, off the book. >> burner phones, we call it the sexting phone.