What deaf major leaguer hit .277 for a major league team one season
and never again played in the majors?

It was Reuben Stephenson, a graduate of New Jersey School
for the Deaf. He played in the minors, and was called up
by the Philadelphia Phillies during the closing weeks of
the 1892 season. He hit .277 during his brief time with
the Phillies. For some reason, the Phillies never promoted
him to the majors again.

If he hit .100 it would be understandable, but .277
is a pretty good batting average!