and i ran upstairs. my husband was asleep. and i said, toni's gone. >> reporter: kim found the tragedy almost unimaginable. remember, she'd known harold for decades and had been best friends with his first wife lynn who died 17 years earlier. >> i just felt so sad. i felt like i could not believe that toni was gone. it just felt like i wish i could have changed it. i wish i could have brought her back. >> reporter: but soon for some people sorrow would be coupled with another feeling -- suspicion. coming up -- >> my husband said, we can't let this go. please investigate this.