I love my #ChicagoMed #OneChicago family dearly.

And a special thank you to all the fans that have made these last four seasons so amazing."

The actor added it was “an honor” to be part of the franchise.

Colin Donnell poses on the red carpet

Donnell played Dr. Connor Rhodes since the show’s inception and also made guest appearances on"Chicago P.D.

“and “Chicago Fire.

But, why did Donnell walk away in the first place?

Colin Donnell smiles at an event

This essentially means it wasn’t his choice to leave, rather they were simply finished with the character.

Donnell’s departure was especially sad because it led to the actor leaving the Windy City, too.

Thanks for all the memories, we’ll visit often.”

Thankfully, the actor has remained booked and busy.

He also found time to form a band called The Nineteen Twenty.

Elsewhere, the actor worked alongside real-life wife Patti Murin in theHallmark Channel movie"Love on Iceland.”

We’ll just have to wait and see.