in central park on saturday. it included performances by adam lambert and alee is a keys and many more. now back to "dateline." welcome back to "dateline." i'm craig melvin. forgery conviction and fake college transcripts and allegedly affairs. the more they looked into martin mcneil the more the fraud and another scheme was about to make the detectives question if martin was capable of much worse. once again, here is keith morrison with "secrets in pleasant grove." >> reporter: martin mcneil sieged. their father had turned to family home into a love nest for a so-called nani, the mistress.