Byrne plays journalist Rebecca Skloot -- the author of the book the film is based on -- who gets in touch with Deborah to uncover the truth and tragedy behind her mother's unwitting contribution to science.
In the new intense, emotional trailer, it's clear Henrietta's family was unaware of what was being done to and taken from her as she was hospitalized fighting cancer, nor were they informed of what impact Henrietta's "immortal" cells had on the world of medicine.
The Immortal Life of Henrietta Lacks premieres April 22 at 8 p.m. ET/PT on HBO.