Page 26 - Inside Mexico News Today : Breaking News, Live Updates & Top Stories | Vimarsana

>> reporter: without any clear answers from mexico, the hartleys have turned to intelligence sources north of the border who can try to explain why the couple was targeted. former intelligence official fred burton has been studying a turf war in mexico between two drug cartels. a former band of military guards called the zetas and the more traditional gulf coast cartel. >> 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 thi...

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 you this, based on their past record, i think they have a -- somewhat of a zero solvency rate and a zero conviction rate. >> reporter: there is one more piece of evidence. a small blood spot on the life jacket tiffany hartley wore the day she says her husband was shot. the blood is from her husband. sheriff gonzalez says a dna test confirms it, but even the dna match remains...

Newspaper attention still at viral levels, authorities in texas were trapped. they could dispatch all the boats and helicopters they wanted, but law enforcement in mexico was still in charge. and what happened next in mexico showed just how difficult getting any answers would be. >> one mexican detective did try to find out what happened to david hartley. but his head was severed from his body and his decapitated head was delivered to the mexican army here in a border town. his name, rolando viegas. his suspects, brothers who lived near the half submerged church in mexico, old guerrero. it's u...

>> honestly, looking at the barrel of the gun is all i saw. >> reporter: the cbs morning news. >> we never really had that feeling that something was going to happen that day. >> reporter: but word began to leak out even from mexico that her story was being doubted. >> so she kept on coming this way. >> reporter: the zapata county sheriff, siggy gonzalez was the first american law official to speak with her. >> it seems something made up. seemed like a story out of the comic books. >> it's hard, because -- >> reporter: but tiffany hartley is insistent on telling her version of what happened. h...

See a sunken church. he is sick of the media attention and insists that the lake and the fishermen are completely safe as long as they follow these unwritten rules. >> this is not a jet ski lake. never a jet ski seen. they come, they show up on jet skis that they don't see, then they try to approach them and stop them, because it's a war over there. two cartels fighting each other for control, and they don't stop. they take off running. >> colette agreed to take us to old guerrero, eight miles into mexico, into what he describes as a drug war, to show us just how safe it really was. but before...