Nationals pitcher Sean Doolittle announces his retirement after more than a decade in the majors – KION546
Sean Doolittle retires after 11 MLB seasons with a 'full heart
Nationals Re-Sign Sean Doolittle To Minor League Contract - MLB Trade Rumors
All-Star reliever Sean Doolittle retires after 11 seasons - Field Level Media - Professional sports content solutions
Two-time All-Star reliever announces retirement
Sean Doolittle - Age, Family, Bio
Reliever Sean Doolittle announces MLB retirement after 11 seasons – NBC Sports Bay Area & California
Sean Doolittle retires from MLB
Washington Nationals reliever Sean Doolittle heads to IL with sprained elbow - ESPN
Sean Doolittle retires after path led to All-Star, World Series honors
Sean Doolittle, known for his liberal views, won't be at the White House on Monday - The Boston Globe
Sean Doolittle retires after path led to All-Star, World Series honors