STROUDSBURG, Pa. — Four men initially charged with murder in the hazing death of a Baruch College freshman pleaded guilty to reduced charges on Monday. The four were involved in a fraternity initiation in which the authorities said the 18-year-old student who died, Chun Hsien Deng, fell unconscious and the other fraternity members delayed seeking medical aid.

The students had traveled in the winter of 2013 to the Poconos from New York City for a weekend retreat where potential members went through a hazing to join Pi Delta Psi, an Asian-American fraternity. Mr. Deng was one of the pledges, and the authorities said he was knocked out after he was blindfolded, forced to wear a backpack weighted with sand and pummeled by other fraternity members as he tried to cross a frozen yard.

Almost two years later, Monroe County prosecutors announced that 37 people had been charged in connection with his death, many facing counts such as assault and hindering apprehension. Five of them, as well as the national fraternity itself, were charged with third-degree murder, which does not involve premeditation or a specific intent to kill.

Four of the men who had been charged with murder — Kenny Kwan, 28; Charles Lai, 26; Raymond Lam, 23; and Sheldon Wong, 24 — appeared in court here on Monday, where they pleaded guilty to reduced charges of voluntary manslaughter and hindering apprehension after reaching an agreement with prosecutors.