>> corporate executive, caring mom, a million dollar smile and a $4 million estate. >> oh my god! >> i need an ambulance! >> murdered. >> i went screaming out of the house. >> this was a prominent woman murdered in her home late at night. >> almost certainly someone she knew? >> correct. >> where would it lead? a twisted case of betrayal and greed. >> the finger is being pointed at me. >> her own daughter, a suspect from the start. >> you pull the knife out and you tell the police, oh, you're going to find my fingerprints on the knife. >> her son-in-law, who seemed so devoted. >> they interrogated us for eight hours. >> or maybe someone else with a million dollar motive? >> what's going on here? how many people are involved in this? >> devious. it's an evil mind. >> someone just doesn't turn into a murderer.