[cnn-photo-caption image=http://www.cnn.com/video/crime/2010/10/08/ac.tiffany.hartley.cnn.640×360.jpg caption="Tiffany Hartley said her husband, David, was shot and killed on Falcon Lake last month." width=300 height=169]
CNN Wire Staff
(CNN) - Mexico police are searching for two suspects in the case of a U.S. citizen who disappeared during a sightseeing trip on the U.S.-Mexican border in South Texas, authorities said Monday.
The suspects are two brothers who are "well known to this area," according Luis Homero Uvalle, a spokesman for the state attorney general. He identifed the suspects only as "El 27" and "El 31."
David Michael Hartley went missing September 30. His wife, Tiffany, told authorities her husband was shot and killed during a sightseeing trip on Falcon Lake, which bisects the international border.
On Monday, Tiffany Hartley, along with David Hartley's mother, Pam, appeared on several morning talk shows asking for information that will help investigators find those responsible for David's death and find his body.
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