The 39-year-old opened up about the Fox show's axing, saying that he wished it could have at least gotten a second season.
"We were just finding our feet," O'Mara told Collider. "I think we proved that, by the season finale.
"There was a lot more story to tell and I think there was an audience to watch it," he continued. "Certainly internationally, the show went down extremely well with huge numbers. Domestically, it didn't quite get there."
The actor went on to admit that the show made mistakes during its first and only season.
"Creatively, we probably could have made some slightly better decisions, halfway through," O'Mara admitted. "But that's par for the course with such an ambitious series.
"We needed more than 13 episodes, I think. Honestly, we were on the bubble, and we were a show that they should have just gone with their gut on and taken another shot with, for another season."
O'Mara recently joined the cast of a CBS gangster series starring Dennis Quaid.