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Mr. Green said he caught himself leaning over the subway platform’s edge and realized maybe he shouldn’t do that.

“It does make you more conscious,” he said of the deaths.

Such subway deaths are rare, but other high-profile cases include the 1999 fatal shoving of aspiring screenwriter Kendra Webdale by a former psychiatric patient. That case led to a state law allowing for more supervision of mentally ill people living outside institutions.

• Associated Press writer Karen Matthews contributed to this article.