Swampy

I also enjoyed the season very much and I really liked the finale (except for the scenes with Bree + Roger).

Same here :-)

He (Murtagh) is shown with Jamie in Season 3 Episode 3. They actually talk a lot there. Just rewatched the scene with Lord John. Jamie sais: "I would settle for one man, then. My kinsman, Murtah Fitzgibbons. He's been struggling to survive here ever since Culloden."

I always assumed, that Murtagh came to Ardsmuir right after Culloden. When Jamie makes the deal to get medical treatment for Murtagh with Lord John in the Ardsmuir-Episode in Season 3 he sais to Lord John "He's been struggeling to survive here, ever since Culloden."