Why did Ed Quinn leave Eureka?
Allison has two children: Kevin by her (unnamed) first husband and Jenna by second husband, Nathan Stark.
Is Ed Quinn still married?
He has not yet granted her a divorce. Throughout season 2, Allison and Nathan’s relationship grows, and eventually results in Nathan proposing to Allison and she accepts….
Does Carter end up with Allison in Eureka?
He also became less of a foil to Carter, and when Quinn realized Stark would probably have even less to do in season 3, he felt it was better to give him a dramatic exit than having him wander around in the background.