not the way cindi pardini saw it.> i was happy at this point i was hopeful. >> reporter: hopeful that when he was released, she would get justice for herself in california. >> san francisco would finally wake up and extradite him. so i spent that year saying what are we going to do? can you at least charge him? >> nothing. >> nothing is ever that easy. >> reporter: cindi got a tip that derek was free again. she had no illusions that he had somehow learned his lesson. she figured the short jail stay was just the price of doing business and it was only a matter of time before he pulled another con. sure enough. >> in august of 2016 i get a message he is back in action. >> and you are just like ugh. >> reporter: the message in her inbox was from a woman named missy brandt. a flight attendant from saint paul. she told cindi every disturbing detail. it started like so many others on a dating site. >> i was at a point where i figured i would like to meet somebody. >> reporter: she quickly found a match. someone named richie

. >> many believed derek alldred has cindi pardini to thank for his time behind bars. >> cindi was the one to bring them altogether. she is the hero. >> i walk forward every single day and every day that i walk forward i am walking further away from this situation. >> does it also give you comfort in knowing that the prison that derek alldred is and is no four seasons? >> exactly. he's just my first love. >>> hello, i am craig : melvin,h and this is dateline. >>> you have one that got away? >> he was my first love >> the guy who disappeared? except, in her case he really disappeared. >> he is going to call me and a couple of days. he never called. his family and agony. >> america's most wanted. >>> a rookie detective finally broke the case. >> i said, oh my gosh, they got him. >> a strange phone call, revealed a secret. >> david needed to be gotten rid of it >> we got the real story. >> a bombshell revelation. was she really a bereaved x? or just maybe a black widow? >> she is in the middle. >>> hello, and welcome to dateline. for years, judy carlson lived in the most painful kind of l