Adams announced his retirement from baseball Sunday, Derrick Goold of the St. Louis Post-Dispatch reports.
Adams will not be on the Nationals' Opening Day roster, Zack Meisel of The Athletic reports.
Adams will return to Washington after signing a minor-league contract with the Nationals on Wednesday, Bobby Blanco of MASNSports.com reports.
Adams was released by the Rockies on Tuesday.
Adams (elbow) was reinstated from the 10-day injured list prior to Saturday's game against the Padres.
Adams (elbow) appears to be close to beginning a minor-league rehab assignment, Thomas Harding of MLB.com reports.
Adams (elbow) hasn't been cleared for hitting or throwing since being placed on the 10-day injured list June 9, MLB.com reports.
Adams was placed on the 10-day injured list with a right elbow strain Wednesday.
Adams suffered a right elbow injury Tuesday against the Marlins and is expected to be placed on the injured list, Patrick Saunders of The Denver Post reports.
Adams (shin) was reinstated from the 10-day injured list Saturday.