Daniel Penny pleaded not guilty to manslaughter charges in a Manhattan courtroom Wednesday morning for the chokehold death of homeless man Jordan Neely.

The 24-year-old former Marine — who appeared in Manhattan Supreme Court clean-shaven and wearing a blue suit and maroon tie — was arraigned on charges of second-degree manslaughter and criminally negligent homicide.

Penny entered the not guilty plea during the brief hearing, which lasted just a handful of minutes.

Penny — who is free on $100,000 bail — faces up to 19 years behind bars if convicted on both counts.

The Long Island native was caught on video putting Neely — who witnesses said had been threatening subway riders — into a chokehold on an F train on May 1.

This story is developing.