Donald Fagen has been forced to cancel the remaining dates of his North American tour due to illness. The Steely Dan co-founder was on tour with his band The Nightflyers.

Along with two shows earlier this week, Fagen cancelled tomorrow night’s gig in Saratoga, CA, and a San Francisco performance slated for Sunday. Fagen will look to get back on the road with The Nightflyers later in the month in Japan.

The news comes on the heels of the tragic passing of Fagen’s longtime collaborator and co-founder of Steely Dan, Walter Becker. Fagen recently confirmed that the scheduled Steely Dan dates next month are still set to go on as planned.