Chicago PD premiered in 2014. Jesse Lee Soffer, who played Detective Jay Halstead, joined the series from the pilot episode and remained the core member of the Intelligence Unit until season 10.
Will Halstead was the heart of Chicago Med. Halstead was the original reason for the spinoff — he was the brother of Chicago PD's Jay Halstead. Will was a rebellious resident who constantly did ...
Chicago Med is part of the One Chicago franchise ... Will Halstead is the older sibling of Chicago P.D. detective Jay Halstead, establishing a familial connection within the One Chicago franchise.