Arie Luyendyk Jr. led the final practice for the Indy Racing Infiniti Pro Series this morning at Kentucky Speedway, a session in which Jason Priestley was seriously injured in a crash.

Priestley was transported to University of Kentucky Medical Center in Lexington, Ky., after crashing in his No. 7 HomeMed Pharmacy Dallara/Infiniti/Firestone in Turn 2.

Luyendyk led the session at 29.4564 seconds, 180.878 mph in the No. 5 Luyendyk Racing Dallara/Infiniti/Firestone. Pole winner and points leader A.J. Foyt IV did not participate in the session.