These are some pictures from the last months of his life. Lennon changed his hair at least ten times in 1980. From 1979 to early August 1980, he grew it long. From 1979 through May 1980 he grew and kept a thick beard. A lot of evidence suggest he was very unhappy with his appearance and kept changing it up as a result.
November 1979:

April 1980, full beard and ponytail:

June 1980, long hair and pulled back in a ponytail:




Early August 1980




By late August 1980, he'd gotten the first of several haircuts.

By October 1980 he was letting his hair grow again:


By November he had long hair and long bangs:




The next day, Dec 6th, he cut his hair yet again


The morning of his death, he had a second haircut before this last photo, to shorten the bangs even more
November 1979:

April 1980, full beard and ponytail:

June 1980, long hair and pulled back in a ponytail:




Early August 1980




By late August 1980, he'd gotten the first of several haircuts.

By October 1980 he was letting his hair grow again:


By November he had long hair and long bangs:




The next day, Dec 6th, he cut his hair yet again


The morning of his death, he had a second haircut before this last photo, to shorten the bangs even more

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