Chicago Fire Bosses Spill Details on the Return of Sylvie Brett and a Kidd-Severide Wedding 

Chicago Fire fans grappled with the absence of Stella Kidd (Miranda Rae Mayo) for several months before the firefighter returned to Firehouse 51 and now

Sylvie Brett (Kara Kilmer) is following her example and a paramedic. As in taking leave from her job.

leaving another hole in the story until his return.The writers send Kidd on a trip to other cities to set up a Girls on Fire program

but Brett's absence is being explained by a more personal matter of heart. He has made time to spend with Matthew Casey (Jesse Spencer) in Portland,

where he is raising two boys whose firefighter father was killed in the premiere episode of Chicago Fire.

"He needed to recharge his battery," showrunner Derek Haas told Parade.com. He then went on to say,

"I would just say that in any season, but especially this, the 10th one, when actors sign up for the show, it becomes 22 episodes and it becomes their life. 

They go from July to May, and they have a life outside of these shows. And so, from time to timeā€¦ the real life comes."

Then he joked, "I mean, who wouldn't want to go see Casey this long? So, she's doing it."