Kara Killmer

Firehouse 51's sweetheart tied the knot and launched a new chapter in her life outside Chicago.

Grab the tissues and revisit some of "Brettsey's" cutest moments as a couple on Chicago Fire. 

Mayo and the rest of the Chicago Fire cast bid Killmer farewell after her last-ever episode of the series.

After 5 seasons of One Chicago bliss, the paramedic and the firefighter are finally husband and wife.

"It is just so satisfying to get to see them finally make that commitment to each other," Killmer told NBC Insider.

Only a couple like Brett and Casey could turn a fish supplies store into a romantic wedding venue.

Brett's character is stepping away from Firehouse 51 to focus on her family. 

Chi-Hards always love a Matt Casey guest appearance — and this time, we hear wedding bells! 

The actress' character, Brett, adopted baby Julia in Season 12.

Greensmith showed off her skills behind-the-scenes of Chicago Fire.