Falcon Lake, part of the Rio Grande situated directly on the Texas-Mexico border, has recently become a haven for the pirates, and there have been at least five reported run-ins with pirates on the lake this year, although this is the first reported death.
"The one thing I dreaded on Falcon Lake has happened," Texas' Zapata County Sheriff Sigifredo Gonzalez said days after the attack on the Hartleys. "The lake is not secure, the border is not secure because the incident that I dreaded the most has, in fact, happened. We cannot go to Mexico, we cannot recover that body, we cannot conduct an investigation, we have to tell the family we can't do anything about it."
ABC News' Kevin Dolak and Sarah Netter, as well as The Associated Press contributed to this report.