James 'Scotty' Doohan was diagnosed with Alzheimers in the last few months. Doohan is 84.
He is just in the beginning stages of the neurological disorder.
Doohan also has suffered for some time with Parkinson's disease, diabetes and fibrosis due to chemical exposure during World War II and the D-Day invasion in France.
Doohan, back in January, made a cameo appearance in the horror film "Skinwalker: Curse of the Shaman", this film has not yet been released. This will probably be his last film appearance a spokesperson said for Doohan but he will attend the 3-day 'Star Trek' farewell convention Aug. 28-30. All the surviving members of the original cast of Star Trek will attend.
Star Trek fans will surely be saddened by this news and will say a few prayers for Doohan and his family as he deals with this illness.