CHARLOTTE, N.C. — official release — FOX Sports photo — Longtime NASCAR on FOX on-air personality Steve Byrnes is taking an indefinite medical leave of absence to focus on his health after receiving news he has suffered a recurrence of cancer.

Byrnes, who was diagnosed and successfully treated for head and neck cancer in late 2013, will step away from his NASCAR RACE HUB co-hosting and NASCAR Camping World Truck Series play-by-play duties for FOX Sports 1 to concentrate on his upcoming medical treatment and time with his family.

Any further updates on Byrnes will come at the discretion of the family.