Robert Stephen Haggerty of Attleboro, retired educator, community leader, and minor league baseball player, died Monday at his home. He was 79.Mr. Haggerty was born in Fall River and was a longtime resident of Attleboro.He was a graduate of De La Salle Academy in Newport, R.I., and earned his bachelor’s degree from Bridgewater State University, where he was the captain of the soccer and baseball teams, and a master’s degree from Rhode Island College.He was a veteran of the Army.