|Manner of Death:||Neck snapped by Paul Dierden|
|Family:|| Virginia Coady (adoptive mother)|
|Portrayed by:||Ari Millen|
|First appearance:||"By Means Which Have Never Yet Been Tried"|
|Latest appearance:||"Certain Agony of the Battlefield"|
Along with the other Castor clones, it is mentioned that Miller and his brothers were brought to Dr. Virginia Coady and the military, where they grew up and received training.
In "Transitory Sacrifices of Crisis", Miller and his military colleagues administer a "stress test" on Helena, whereby they begin waterboarding her (a form of torture). The test is abruptly stopped by Dr. Virginia Coady, who informs the men that Helena is pregnant.
Later in the episode, Miller is seen standing by while Helena is given a neurological test. She provokes him in anger by saying that she met his brother and that he is ugly.