Deadline reports Ciara Renée will play the role of Kendra Saunders aka Hawkgirl.
It was previously said the spinoff will be bringing in three new DC superheroes previously unseen on TV, with the article noting that Hawkgirl doesn't look to be one of the three as the character previously appeared on Smallville.
Kendra Saunders in the series is described as: a young woman who is just beginning to learn that she has been repeatedly reincarnated over the centuries. When provoked, her ancient warrior persona manifests itself, along with wings that grow out of her back, earning her the moniker Hawkgirl.
It's further said that Kaity Lotz, who played Canary in Arrow, may end up playing one of the three new DC characters, with apparently the new characters to be one female and two male.
Update: Arthur Darvill cast as Rip Hunter.
Ciara Renée joins Brandon Routh (Atom), Victor Garber (one-half of Firestorm), Wentworth Miller (Captain Cold) and Dominic Prucell (Heat Wave).
The untitled Arrow / Flash spinoff is eyed for next midseason.