this made some sense, but detective peglow was no rookie. his investigation into charlie tan and what happened inside that home was just getting started. >> one of the investigators found what appeared to be newly-taken passport photos, along with a list of prominent local defense attorneys. >> that's interesting. >> yes, sir. >> the story is, i had to do it, but you're not taking that at face value. >> correct. >> coming up, a discovery on jim tan's computer triggers suspicion about his time of death. >> how many days prior is the last e-mail check? >> four. >> that was really a big thing for me. >> when "dateline: extra" continues. hippopotamus will do ♪ at the united states postal service, we deliver more online purchases to homes than anyone else in the country. and more hippopotamuses, too. ♪ so whatever your holiday priority, our priority is you. you're hetruck, suv. used car, that's smart. truecar can help. it's great for finding a new car, but you already knew that. it's also great for finding the perfect used car. you'll see what a

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