Sean Doolittle Announces Retirement - MLB Trade Rumors
Nationals pitcher Sean Doolittle announces his retirement after more than a decade in the majors - WTOP News
How Nationals closer Sean Doolittle became a dominant one-pitch reliever - The Washington Post
All-Star Pitcher Sean Doolittle : Bullseye with Jesse Thorn : NPR
I just can't do it': Nationals pitcher Sean Doolittle declines White House invite, Washington Nationals
Former Oakland A's, Washington Nationals reliever announces retirement
Sean Doolittle Announces Retirement : r/Nationals
Sean Doolittle is Nationals' Roberto Clemente nominee
RECAP: Nationals beat Astros 5-4 in Game 1 of World Series