By The Associated Press FILE - A federal agent wears an Immigration and Customs Enforcement badge in New York, June 10, 2025. Yuki Iwamura/AP hide caption MIAMI — A 19-year-old Mexican migrant died at a county jail in Florida that has been holding immigrant detainees, according to U.S. Immigration and Customs Enforcement. According to ICE, Royer Perez-Jimenez "died of presumed suicide," although an official cause of death remains under investigation. The death of Perez-Jimenez on Monday is the 46th reported under Immigration and Customs Enforcement custody since the start of President Donald Trump's administration in January 2025, according to a count by The Associated Press. Perez-Jimenez is the second person to die in ICE custody this week, after an Afghan immigrant — whose family said he had been evacuated from his country after working for years with U.S. forces — died in a Texas hospital after being detained by immigration authorities.…