The Greyhounds (12-5, 4-1), who share the Metro Atlantic Athletic Conference lead with Iona and Niagara, trailed 47-41 with 4:47 left in regulation but tied it on baskets by Etherly and Cormier and two free throws by Robert Olson. Neither team scored in the final 2:07 of regulation.
Baskets by Jordan Latham and Cormier and three free throws by Cormier helped Loyola lead 54-49 with 1:18 left in the extra period, and Olson put it away with 4 of 4 free throws in the final 16 seconds. Loyola made 10 of 12 free throws in overtime.
Olson finished with 12 points.
Josip Mikulic scored 14 of his 16 points in the first half to help the Stags (10-7, 2-3) take a 33-27 halftime lead after trailing 13-7.
Former Kentucky guard Ed Davender, the only Wildcat with at least 1,500 points and 400 assists, has died. He was 49.
Guard Naz Mitrou-Long, whose 2015-16 season ended in December due to hip problems, has been granted a hardship waiver for the coming season, Iowa State said.
As the Sooners look to life without superstar Buddy Hield and his sidekicks, it's clear their unseasoned players will need to grow up fast.