Doc Yewll is a fictional female Indogene doctor in the Defiance television series who was portrayed on screen by Trenna Keating. Doc Yewll is Defiances chief medical officer.
Yewll has a dark past, before peace broke out between humans and Voltan Collective, Yewll was responsible for human experiments. The humans either don't know or care about her involvement in the past.
Yewll knew that Ex-Mayor Nicky was secretly an Indogene but had kept it a secret. When Hunter Bell, the proprietor of Need/Want bar found out the truth, Nicky killed and hid Hunter Bell's body. Witness to the murder was a Liberata called Jared who kept knowledge of the murder secret.
After Jared's murder, Yewll saw Nicky as a liability and killed Nicky making it seem as though it was a suicide and taking full responsibility of Hunter Bell's murder. The Bride Wore Black