Why Did Peter Onorati's Jack Mumford Leave SWAT After Season 1 (& Why He Continued To Return Until Season 8)
Peter Onorati played Jack Mumford on S.W.A.T. but left after only one year in season 2. However, there is a reason as to why he left so soon.
https://screenrant.com/why-peter-onorati-jack-mumford-leave-swat/