or if david hartley was working with the cartel. eculation began to swirl that tiffany hartley killed her husband for the insurance money, or even that she 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 were not there that day. so really, they have no room to judge me. >> with television and 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 villegas. his brothers who lived near the church in old mexico. old guerrero, it is unclear i

zero heartburn. >>> david hartley had always been interested in visiting the sunken church in falcon . on thursday morning, september 30th, 2010, a week before he and his wife would move home to colorado, david decided they would go. >> did you know then what you must know now, that there had been several attacks on that lake, that fishermen don't cross into mexico on that lake anymore? >> we did know that there were attacks. we didn't know where exactly. >> you had no worries whatsoever when you took those jet skis out? >> no idea. >> and as tragic as this is, what i think i'm hearing from you is what the hartleys did was incredibly stupid. >> incredibly. >> fishing guide and resort owner speedy collett says business on the lake has taken a beating since the hartleys made what he called a stupid trip to see a sunken church. he is sick of the media attention and insists the lake and the fishermen are completely safe, as long as they follow the unwritten rules. >> this is not a jet ski lake. there's never a jet ski seen here. they come -- they show up on jet keys that they don't see, a

or if david hartley was working with the cartel. wirl that tiffany hartley killed her husband for the insurance money, or even that she 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 were not there that day. so really, they have no room to judge me. >> with television and 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 villegas. his brothers who lived near the church in old mexico. old guerrero, it is unclear if he went looking fo