"I'd like to thank the Creighton coaching staff for the opportunities that they've placed before me," Washington wrote in a statement.
The decision follows Bluejays head coach Greg McDermott's return from suspension due to racially insensitive language he used during a postgame address. After the team's Feb. 27 loss to Xavier, the 56-year-old told his players he needed "everybody to stay on the plantation."
Washington is the 34th ranked high school prospect on the 2021 ESPN 100, including fifth at the lead guard position and first overall among all players in Arizona.
Creighton's lone remaining top-100 recruit for 2021 is now power forward Mason Miller, the No. 98 prospect, per ESPN.
The Bluejays face Butler in the quarterfinals of the Big East Tournament Thursday.