James Doohan played Scotty the engineer on Star Trek. Now diagnosed with Alzheimer's disease, he has retired from public life. He also has Parkinson's disease and diabetes. He was one of the Star Trek actors who was most accessible to fans, which they appreciated. Tickets to his last appearance with fans, in Hollywood last Sunday, cost up to $1,000 but still drew a crowd. The money was donated for Alzheimer's research. In related news, Patrick Stewart (Captain Jean-Luc Picard) had an angioplasty procedure last week to widen an artery. So these Trek actors are down-to-earth humans after all.