I do not have information on a specific celebrity who has been diagnosed with Alzheimer's disease and is no longer in the news. It's important to note that my information might be outdated, and there may have been developments or news events after that time.
If there has been a recent case of a celebrity being diagnosed with Alzheimer's disease and not being in the news anymore, I wouldn't be aware of it. News coverage can vary depending on the individual's level of public prominence, their personal preferences for privacy, and the overall media focus at any given time.
For the most current and accurate information, I recommend checking recent news articles, credible news sources, or conducting an online search to see if there have been any updates on this topic.