|First appearance||I'm So Lonesome I Could Die|
|Last appearance||One Is Silver and the Other Pagan|
Nurse Kerwin is a nurse who does the night shift, she instructs Aidan on what he must do since he has recently been put on the night shift. When coming in to check on Kenny, he tells that his blood has been taken already which makes them suspicious especially when according to the file, he was not due to have his blood taken.
in one episode, Nurse Kerwin is accidentally killed by Aidan after discovering that he has been taking blood from Kenny though this turns out to be a dream that Aidan has which was possibly caused by Beth & Holly, the actual Nurse is still alive.