peggy nadell was dead.o her brother jim in florida. >> i called my brother's house. he didn't answer. i called diana on her cell, and i said, mommy's gone. and she started screaming at the other end of the phone. what do you mean mommy's gone? i said, she's gone. she died. something happened. she died. >> reporter: soon clarkstown police detectives stephen cole-hatchard and earl lorence were on the scene. they noticed that susanne looked a wreck, standing in front of the house in the snow. >> susanne is in the driveway, at the foot of the driveway, kind of pacing, looking rather frazzled. >> reporter: she told detectives what she told the 911 operators, that peggy tripped over the cat. >> her mother must have tumbled down the stairs and stabbed herself with the knife. >> reporter: while detective cole-hatchard stayed outside with susanne, detective lorence went inside the house. this is police video of the scene taken that morning. lorence knew right away, this was no accident. >> no way did she fall down t