I was at DragonCon with a group of friends in Atlanta in 2011 and in a large hall where many stars of both large and small screens signed autographs and greeted fans. I spied a face I knew who appeared to be getting ready to pack up before going to dinner. There was no one near him at the time so we approached him quickly and I told him I just wanted to greet him and thank him for his work. He was very appreciative, but as soon as he noticed my accent he was most reluctant to let me go with just a greeting. He packed up and sat on the edge of his booth talking to us for about 10 minutes or so. He asked me about science fiction fandom in Ireland and was curious to know if we had any conventions ourselves - because he said he would've jumped at the chance to visit here. He came across as an intelligent and well informed person who was genuinely interested in meeting people and interested in what we had to say.
The man was Richard Hatch and he was the face of Battlestar Galactica from the original to the modern series. He sadly passed away today at age 71. He will be missed.