After a series of emotional breakdowns as a result of her long-distance relationship, Sylvie also decided to make the leap.
She revealed she would be moving to Portland, to be with her boyfriend Matthew Casey (Jesse Spencer) who fans also had to say goodbye to earlier this season.
Fans also watched as Stella Kidd (Miranda Rae Mayo) settled into her new role as Lieutenant for the first time.
Hopefully for fans, as the week goes on the network will soon release the promo video for episode 17 to give viewers a major insight.
Chicago Fire season 10 will return to NBC on Wednesday, Wednesday, April 6.