"He was the reluctant hero of Halloween, an icon who became so associated with the holiday, it ended his normal singing career.

Bobby "Boris" Pickett, the man behind one of the most famous one-hit wonders in history, died Thursday. The artist who made "Monster Mash" an annual event starting in 1962 was suffering from leukemia and was only 69 years old."

[more at CityNews.ca]

He doesn't mash any more.

Thanks to Bill G for pointing me to the news.
Here we have Mike Tyson and Bobby Brown doing their own rendition:

That's even more sad.