Do you remember this episode of "Happy Days" ?

"The Summer of '42" was about a teenage boy who had an affair with a woman whose husband was killed in World War Two . I read where there was an episode of "Happy Days" that was loosely based upon "The Summer of '42" with Richie Cunningham ( Ron Howard ) befriending a Korean War widow . I don't remember that episode at all, and I could swear that I've seen every episode of "Happy Days" . NOW -- Does anybody in the Yahoo ! Answers community remember that episode ? Do you remember who played the Korean War widow ? Can you give me the episode title ? Thank you in advance for your answers .