Kinney has starred as the firefighter on the Dick Wolf procedural since its launch in 2012.
Cast and crew were apparently informed of Kinneys leave earlier Friday.
It is likely that future scripts will have to be rewritten to accommodate his absence.
Matt Dinerstein/NBC
A spokesman for the show would not comment.
Kinney has been nominated three times for a Peoples Choice Award for his work on the series.
He won in 2015.
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Kinneys Kelly Severide is a member of Rescue Squad 3.
He was long known as a ladies man on the drama (surprised?)
but has recently been in a more stable relationship with Stella Kidd, played by Miranda Rae Mayo.
Theytied the knot at the end of Season 10.
New episodes ofChicago Fireresume February 8 on NBC.
