By Verena Dobnik, The Associated Press on December 22, 2013

NEW YORK,N.Y.- A man involved in a custody dispute who was supposed to turn his 3-year-old son over to the boy's mother Sunday instead threw the child off the roof of a 52-story Manhattan apartment building before jumping to his death, police said.

The man was pronounced dead at the scene and his son, Kirill Kanarikov, was pronounced dead at a nearby hospital, police said.

The boy's mother had custody of the child and the father, who had visitation rights, was supposed to hand the boy over to the mother at a police precinct Sunday afternoon, authorities said.

Luis Ortiz told the New York Post that he was at the hospital when paramedics rushed the boy there and that they were pumping his chest and working on him.   you could tell he was slipping away.

Authorities said the father did not live in the building listed as South Park Tower, which is a short distance away from Columbus Circle and Lincoln Center.

Police investigating the deaths left the building in the mid-afternoon to photograph a grey Lexus RX350 parked nearby.  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 8 stories out of a Harlem apartment window to her death, but the 10-month-old survived.  Authorities found a suicide note in her home.