Allen Sherman died on November 21, 1973, according to the Dead People Server (http://dpsinfo.com/index.shtml), a truly useful site.
I met Steve Allen about ten years ago. he was a speaker at a convention and I worked for the sponsor of the convention. I got to escort him from the ready room to dinner and to have dinner at his table. We were waiting in one of the exhibit halls for his introduction, and a bunch of stage hands were tossing a football around. He put up his hand in the universal signal for "toss me the ball." One of the stagehands tossed it to him, and he reared back and threw that ball the length of the exhibit hall.
A wise and funny man, he will be missed.