Protest took place outside agency's D.C. headquarters on Wednesday
Pablo Sánchez Gotopo passed away at Miss. hospital on Oct. 1
Letter notes 'grave concerns' and 'deficiencies' in detention centers
Letter notes Roxsana Hernández case
Texas Democrat represents border city of El Paso
Dainier Pérez Peña remains in solitary confinement in La. detention center
Yariel Valdés González detained for nearly a year
Kelly González Aguilar detained for more than two years
Yanelkys Moreno Agramonte remains in ICE custody, partner free on bond
Lawsuit alleges Roxsana Hernández denied medical care
