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>> after two years of work, they had generated enough evidence to fill this mail cart. all apparently for naught. the suspect and his key to cracking the case had skipped the state, and detective dove's jurisdiction. >> we were so close. >> reporter: the jessee family sensed dove had been beaten and sandra jessee had won. had gotten away with murder. >> i put his pictures away. i couldn't -- it's tough. because he was so -- he was so fantastic. >> put his pictures away? >> i had to. it just was too much. >> couldn't look at them? >> i couldn't look at them. >> reporter: at the dove home, tom's...

The investigation. >> reporter: there was no hope of any new evidence, of course, like fingerprints or dna. there was just the infuriating puzzle which had become more difficult with each passing year. >> after i reviewed the case, i had no feeling for the family, no feeling for jack jessee. >> reporter: so to get his hand in the game, dove met with the people closest to jack. like his brother david. >> and when i met with david, he inspired me. his determination not to let the love for his brother go was a big motivating factor. >> reporter: but david also had some provocative information. so...

Here again is keith morrison. >> reporter: after two years of relentless police work, tom dove's investigation of the murder of jack jessee had generated enough evidence to fill this mail cart. all apparently for naught. the suspect and his key to cracking the case had skipped the state, and detective dove's jurisdiction. >> we were so close. >> reporter: the jessee family sensed dove had been beaten and sandra jessee had won. had gotten away with murder. >> i put his pictures away. i couldn't -- it's tough. because he was so -- he was so fantastic. >> put his pictures away? >> i had to. it ju...

Wouldn't be surprised if the killed me. he said that. >> reporter: so dove picked through all the original files, hoping he might come across something that had been overlooked. and buried inside, he found this. a simple two-page report apparently unread by any detective. remember the guy who walked into the bar, the one who told a story about the jessee murder? well, years later when the case had gone cold, the bartender decided to call the placentia cops. an officer took the call, typed up the report, and stuck it away in the file where it sat unseen until tom dove came along. >> two things ...

>> these people might literally get away with murder. >> hello and welcome to "dateline extra." i'm craig melvin. jack jessee was a 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 a determined detective hatched an unconventional plan to catch jack's killers. here's keith morrison. "deadly conspiracy." >> reporter: the game is called