EDINBURG, Texas (AP) A South Texas sheriff whose office has attracted the attention of federal investigators has announced his retirement only a year after being overwhelmingly re-elected to a new term.

Hidalgo County Sheriff Lupe Trevino announced his retirement Friday.

One of Trevino's sons, Jonathan Trevino, a local police officer, was arrested by federal agents in December 2012 and later pleaded guilty to participating in a conspiracy where he and deputies stole drug loads to resell to another trafficker. Lupe Trevino denied any knowledge of the rogue unit's actions.

In December 2013, federal authorities arrested Trevino's No. 2 at the department, Cmdr. Jose "Joe" Padilla, on money laundering and drug conspiracy charges.

This week, Trevino's chief of staff and campaign manager, Patricia Medina announced her resignation for personal reasons.