serve as guest hosts this season, replacing Alex Trebek, who died in November at age 80 of pancreatic cancer.Couric, 64, will be the first female to ever grace the lectern as host, the trivia show noted. Rodgers, 37, announced his guest host gig Tuesday, calling Trebek one of his “idols.”“Alex was a legend, revered by all of us,” executive producer Mike Richards said.