Advocacy groups filed complaint with federal officials on April 9
Jennicet Gutiérrez heckled Obama during 2015 event
Protest took place outside agency's D.C. headquarters on Wednesday
Marchers demanded end to ICE detention of trans, HIV-positive people
Letter notes Roxsana Hernández case
Roxsana Hernández passed away in N.M. in 2018
Lawsuit alleges Roxsana Hernández denied medical care
Disease could be 'death threat' to anyone with compromised immune system
Agency faces growing calls to release all trans detainees
Letter notes trans woman died while in agency's custody