IndyStar Colts insiders Stephen Holder and Zak Keefer discuss the Colts offseason, Andrew Luck's progress and more. Clark Wade/IndyStar
INDIANAPOLIS -- The Indianapolis Colts' top returning running back is facing an early-season suspension.
Robert Turbin, entering his third season with the Colts, announced on Twitter on Friday that he has tested positive for a substance banned by the NFL. He'll face a four-game suspension, a major blow to a Colts' backfield that's already hurting to begin with.
"It absolutely killed me that I allowed this to happen," Turbin said.