"He picked up the son and we all know now tragically he went to a building. ... (and) took the son to the roof," the commissioner said. "All indications are he threw him off and that's when he jumped himself."
A friend of Kanarikov had once lived in the building, located a short distance away from Columbus Circle and Lincoln Center. Investigators recovered a security video showing the father and son entering without being stopped by the doorman, and located Kanarikov's Lexus parked outside.
Officers responding to an emergency call reporting two jumpers from the building on the Upper West Side around noon Sunday found Kanarikov, 35, of Brooklyn, and the boy on the lower rooftops of two separate nearby buildings.
The man was pronounced dead at the scene and his son, Kirill Kanarikov, was pronounced dead at a hospital, police said. A witness said the boy was wearing Christmas pajamas.
The motive behind the tragedy remained murky on Monday. Kelly said there was no note found, and investigators have no evidence Kanarikov ever threatened to harm his son. However, at one point, he had told his wife that "unless she signed over the house to him and some undisclosed property, he was going to take the child," Kelly said.
Kanarikov and his wife married in 2009 and lived in Brooklyn, where their son was born a year later. They separated last year, and the mother and son moved to New Jersey and got an order of protection.
It's the second time this year that a parent and child have been involved in a fatal plunge from a New York apartment building.
In March, a woman clutching her baby son in her arms plunged eight stories out of a Harlem apartment window to her death, but the 10-month-old survived. Authorities found a suicide note in her home.