A 36-year-old investment banker was killed in Manhattan on Monday morning when the Citi Bike he was riding collided with a charter bus, the first fatality involving New York City’s four-year-old bike-share program, the authorities said.

The bicyclist, Dan Hanegby of Brooklyn, was riding on 26th Street between Seventh and Eighth Avenues in the Chelsea neighborhood around 8:15 a.m. when he swerved to go around a parked van, struck a bus next to him that was traveling in the same direction, tumbled off the bicycle and fell under the bus’s rear tires, the police said. Mr. Hanegby sustained severe trauma, the police said, and was pronounced dead at Bellevue Hospital Center.

The collision appeared to be an accident, the authorities said, and the 52-year-old bus driver remained at the scene. The Citi Bike program has had more than 43 million trips in the city since it began, a spokeswoman for the service said.

Image Dan Hanegby in an undated photo taken from his Facebook page.

In recent years, bicyclists in New York have said city leaders have not done enough to protect riders. They demanded more safeguards in 2016 after the number of bicycle fatalities surpassed the previous year’s total. Through April, four people had been killed on bicycles in New York this year, according to the city.