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Hartleys themselves were drug runners or if david hartley was working with the cartel. speculation began to swirl that tiffany hartley killed her husband for insurance money or even that tiffany hartley was seeing another man. >> people still have a hard time believing you. does that hurt you? >> some days. other days -- they don't have room to judge. i mean, they don't know me. they don't know my husband. they weren't there that day. so really they have no room to judge me. >> reporter: with television and newspaper attention still at viral levels, authorities in texas were trapped. they coul...

Telling the truth. a surveillance photo taken that very afternoon, one hour after the attack. >> if you notice there on the front of the boat, you see bundles of marijuana there. >> reporter: it shows a small boat and a group of men, one in a black shirt fitting the description give by tiffany hartley. and what sheriff gonzalez is information the mexican sheriff had from the very first day. >> reporter: sheriff, i've got to ask you, is that possible that mexico is going to find, catch and adjudicate the killers in what is a lawless part of mexico? >> i really cannot answer that, but i can tell...

Come forward to him. witnesses he says who claim to know what happened here that day. they describe a military-style attack. three boats, several shooters, and hundreds of rounds being fired at two jet skiers. >> the shot that killed david hartley was an unlucky shot. >> reporter: the sheriff now believes the killers were instructed to kill tiffany hartley, too. what happens next, he says, is a scenario he has put together from three witnesses on the mexican side of the lake. one source in mexico and at least one witness who told cnn that he saw a high-speed chase on the u.s. side. a boat chas...

The border is that there are certain portions that are not controlled by the mexican government. and the area of falcon lake was directly controlled by the zetas, and this was a very strong smuggling corridor for them. >> reporter: so you believe this was mistaken identity? >> clearly, all evidence indicates that this was a case of mistaken identity based on the tactical intelligence i've seen surrounding the case. >> the most likely scenario is, david and tiffany hartley had wandered into a drug war and were mistaken as the enemy. >> reporter: zapata county sheriff siggy gonzalez believes the...

>> what most people don't realize when you're looking at the border is that there are certain portions that are not controlled by the mexican government. and the area of falcon lake was directly controlled by the zetas, and this was a very strong smuggling corridor for them. >> reporter: so you believe this was mistaken identity? >> clearly, all evidence indicates that this was a case of mistaken identity based on the tactical intelligence i've seen surrounding the case. >> the most likely scenario is, david and tiffany hartley had wandered into a drug war and were mistaken as the enemy. >> re...