A 46-year-old man was charged Wednesday with fatally stabbing a rider on a New York City subway train last week after the two got into an argument during the morning rush.

The man,identified by the police asLuis Jose-Duarte, was charged with manslaughter for his role in the death of the rider, John Sheldon, 38, according to the police. Mr. Jose-Duarte was arraigned Wednesday evening and pleaded not guilty.

The stabbing, the first homicide in the city’s subway system this year, took place Friday morning after Mr. Jose-Duarte and Mr. Sheldon began fighting on a downtown No. 5 train, the police said.