with doting grandfather jack jessee at the helm his big and blended california family seemed like one happy bunch. then jack was found stabbed to death in his living room and police wondered if the jessees weren't as close as they seemed. the case went unsolved for years until an ace detective hatched an unconventional plan to catch jack's killers. here's keith morrison. >> reporter: the game is called "mousetrap." a little ball on its track. the tiny taunting mice which, unless every lever works in unison, will not be caught. and how often things go wrong to allow the mice to get away. so odd that what really happened could so eerily mimic a children's game. >> oh how nice! >> reporter: these are the people it happened to, the jessee clan of orange county, california. they vacation together -- >> i'm tired, i'm ready to go home. >> reporter: share birthdays -- >> this one's for bev. >> happy new year! >> reporter: even got together for a monthly game of 10-pins. what these grainy home videos don't show is what is yet to come. which is murder, conspiracy. one branch of the family agai

it was the summer of 2006, eight years after jack jessee's murder. and justice? up -- finally, the break detectives had been waiting for. >> she wanted jack dead. she wanted it done at the house and make it look like a robbery. >> the information that he provided would blow the case wide open. >> until something slammed it shut again. when "deadly conspiracy" continues. ve me. but you can believe this, real esurance employee nancy abraham. look her up online. esurance, it's surprisingly painless. - did you know, the exact same hotel room can have many different prices? it all depends on where you look. - wait, you paid how much? - oh, dear! - well, this is awkward. that's why tripadvisor checks over 200 booking sites (cash register ringing) to find you a great price, and the hotel you want, so you don't end up overpaying for your room. no offense. find the right hotel room for the right price. ♪ hoo! read reviews, check hotel prices, book things to do. tripadvisor. to be nobody but yourself in a world which is doing it's best to make you everybody else... ♪ ♪ mea

it was the summer of 2006, eight years after jack jessee's murder. and justice? t, if ever. >>> coming up -- finally, the break detectives had been waiting for. >> she wanted jack dead. she wanted it done at the house and make it look like a robbery. >> the information that he provided would blow the case wide open. >> until something slammed it shut down. when "deadly conspiracy" continues. worse. try parodontax toothpaste. it's three times more effective at removing plaque, the main cause of bleeding gums. leave bleeding gums behind with parodontax toothpaste. >>> welcome back. after years of relentless police work, brett schrauben and sandra jessee were arrested for the murder of jack jessee. brett was in jail awaiting trial. but in a devastating blow for jack's loved ones, the judge released sandra citing a lack of evidence. then detectives got a lucky break. someone had a story to tell. and it would send this case into overdrive. once again, keith morris. >> reporter: sitting in a cell, month after month, can do a lot to alter a person's take on the world. ev