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Originally discovered... in jellyfish. in clinical trials, prevagen has been shown to improve short-term memory. prevagen. the name to remember. next thi next this friday night, the family from iowa on vacation in mexico. the parents and two children discovered dead in the condo they had rented. here's abc's matt gutman. >> reporter: tonight, mexican authorities are investigating the mysterious culprit that killed that vacationing family from iowa. investigators say they found the sharps, kevin, amy, sterling and adriana in the condominium they rented at this seaside resort in tulum.

The sharps traveled from their home in creston, iowa to tulum for spring break last thursday. when they landed, they let family know they got their safely, but then radio silence. >> that's what we thought was kind of unusual because last year they shared pictures about every day. >> reporter: first, the family missed the meeting with friends and then they missed their flight home yesterday. even though they had said they wanted to get back to watch their local basketball college team in the division ii tournament. >> we were hoping we would hear from them by then, and when we did not, we knew...