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After Mr. Giri was attacked, the police said, his assailant traveled south and stabbed a tourist from Italy who is expected to survive.

The man, who is 27 and was spending his first day in New York, was struck in his torso near the northwest entrance to Central Park, several blocks away from the initial stabbing.

The separate attacks, which the police said they believed were both unprovoked, rattled those in the neighborhood.

As students and staff members entered the building on campus where Mr. Giri worked, and walked through other nearby areas, some said they had not yet heard of the attack.

But Jacob Solomon, a first-year Ph.D. student at Columbia, said he learned of Mr. Giri’s death as soon as he woke up on Friday. He said there was a sense of helplessness among some students, who feared falling victim to a similar random attack.

“It was just an unprovoked stabbing which is, I think, even more unsettling,” Mr. Solomon, 23, said.

Another student, Haswanth Venkatavijayan, said that he lives across the street from where Mr. Giri was stabbed and had walked there about a half-hour before it took place.