Grey also guest-starred on Season 2 of the CBS TV medical drama '' Code Black '' as Beth Jensen a young queer woman battling abdominal pains . She then guest-starred on Season 4 of the Comedy Central series '' Drunk History '' where she portrayed gay rights activist Marsha P. Johnson . Upon its release , the episode trended on Facebook for two days and was nominated for a GLAAD Media Award for Outstanding Individual TV Episode . The same year the episode was nominated for two Primetime Emmy Awards . Grey was even considered for an Outstanding Guest Actress in a Comedy Series nomination . On June 3 , 2016 , it was announced that she was cast alongside Michael K. Williams and Phylicia Rashad to play trans activist and pioneer Seville Anderson in the new ABC mini-series '' When We Rise '' . In the fall of 2016 , she was cast in a recurring-guest role on '' Chicago Med '' , in which she plays Denise , the older sister of head charge nurse Maggie Lockwood . She appeared as a guest star on the legal drama '' Doubt '' in 2017 with co-star Dule Hill . Grey played Delilah Johnson , a woman on trial for the murder of a famous athlete . The storyline was based off the real life story of CeCe McDonald
Primetime Emmy Awards
69th Primetime Emmy Awards
Alexandra Grey