Matt Casey's Most Heartbreaking Moment On Chicago Fire

By the close of Season 2 of "Chicago Fire," Matt Casey and Gabby Dawson, ship-named as Dawsey, have their coupledom certified when Casey seals the deal by proposing — only to have Gabby fail to answer him when they're suddenly called to a structure fire. But when fellow firefighter Leslie Shay (Lauren German) is killed when the building collapses, Gabby puts off committing to Casey as she struggles with her grief over her friend's death. As time goes by, however, Dawsey again appears to be headed for better days when Dawson tells Casey she's pregnant with his child.

But early in Season 4, Gabby is rushed to Gaffney Med with serious abdominal pains. In surgery, it's revealed that she's had an ectopic pregnancy, and there will be no child for her and Matt. After all the optimism of the previous episodes and the joy both parents felt at the prospect of welcoming a child into their lives, this tragic development cast a shadow not only over the immediate scene, but over the remainder of this relationship, which Gabby will eventually abandon when she moves to Puerto Rico. And this makes the loss of the child he'd hoped to have with Dawson stand as the most heartbreaking moment for Mathew Casey in all ten seasons of "Chicago Fire."