The suspect, identified as Thomas Scully-Powers, launched the attack while the father, Dwight Powers, 72, was video chatting with several people around noon Thursday in an apartment in Amityville, a Long Island suburb of New York City, the Suffolk County Police Department confirmed in a statement.
Several people who claimed they witnessed the killing called 911 and reported the attack.
Scully-Powers ran from the scene but was apprehended by police about a mile away. He was to be taken to a hospital after suffering minor injuries from jumping out of a window, the Daily Voice of Mount Pleasant reported.
The investigation is continuing, police said.