Richard Briers' health deteriorated after being diagnosed with emphysema five years ago.
In an interview at the end of January, he told how he blamed his years of smoking for the condition.
"It's totally my fault. So, I get very breathless, which is a pain in the backside. Trying to get upstairs... oh God, it's ridiculous.
"Of course, when you're bloody nearly 80 it's depressing, because you've had it anyway."
More top news
Weather throws a wobbly as it's seriously disappointing for summer.
The Bank of England governor has suggested there may soon be a cut in interest rates.
The motorist at the wheel of a self-driving car has died after it crashed with a trailer, the first Autopilot death reported in the US.