In perl.perl5.porters, Philippe Bruhat wrote:

I'm very sorry to be the bearer of sad news, which I just learned
from a co-worker who was in regularl contact with Zefram.

He forwarded me this:
We are sad to announce that Zefram (Andrew Main) died yesterday
(2025-03-10) after being hit by a train. Further details are not yet
available. Everyone close to him is very shocked by this and contact
details and further arrangements will be announced in future.
He was a long-time and prolific contributor to Perl core and CPAN,
and he will be missed.

I will forward further details (memorial or place to send condolences)
as I receive them.

Christian Walde then followed up with:

Thanks for bearing the news BooK, even if it is sad news.

As an additional bit of info, his personal website's section on this 
matter is relevant: https://www.fysh.org/~zefram/personal/death