Susan Heher Erin Moran,  Happy Days, TV, 1974-1984.   In the pilot - actually an episode of Love, American Style - Richie Cunningham’s sister, Joanie, was Heher. In the series, she became Moran for 239 episodes - 69 more than than The Star, her screen bro, Ron Howard!  Copyright © 2023 Crawley's Casting Calls. All Rights Reserved. Joomla! is Free Software released under the GNU General Public License.