Sign up for The Brief, The Texas Tribune’s daily newsletter that keeps readers up to speed on the most essential Texas news. A third person with ties to U.S. Rep. Henry Cuellar’s bribery case has pleaded guilty, according to a recently unsealed plea agreement, after the South Texas Democrat was accused of accepting nearly $600,000 in bribes from Azerbaijan and a Mexican bank. Irada Akhoundova pleaded guilty to unlawfully acting as an agent of the Azerbaijani government and a state-run oil company, a violation of the Foreign Agents Registration Act, on May 1, according to the plea deal first reported by the San Antonio Express-News.