United Nations headquarters New York
© AFP/Getty ImagesUnited Nations headquarters in New York
A game of "trust" took a deadly turn for an Australian diplomat, who plunged to his death from his Manhattan balcony early Wednesday during a night of boozing with friends and his wife, police sources said.

Julian Simpson, 30, fell from the seventh floor to a second-floor landing at the Clinton Street building where he lived on the Lower East Side around 1:35 a.m., the sources said.

Simpson was playing a "trust game" with a male pal when he accidentally took the fatal fall, a source said.

"I will prove it that you can trust me. Let's play the trust game," Simpson said to the 24-year-old man just moments before he slipped and fell, sources said.

Simpson and his wife were out with friends for dinner and drinks before the group returned back to the Clinton Street residence and went up to the building's wraparound roof deck to the enjoy the views of the Empire State Building, witnesses said.

The iconic landmark tower was lit up in rainbow colors in celebration of Australia's same-sex marriage vote.

While on the roof, the diplomat, who serves as the second secretary to the UN for Australia, then climbed to a higher roof landing where he began swinging a female friend around, sources said.

Once he put her down, everyone decided to go back inside.

While inside, the 24-year-old man, who is the husband of the woman Simpson had been swinging, confronted Simpson over the gesture, sources said.

The two men then stepped out onto Simpson's balcony, where Simpson told the husband that he meant no harm, according to sources.

To prove to the husband that he could trust him, Simpson suggested playing the "trust game" - in which Simpson would lean back on the ledge and trust the man to catch him before he would fall.

Simpson jumped up onto the balcony railing and sat on it facing the apartment before he fell backward, sources said.

The man told investigators that he put his arm out to catch him, but Simpson slipped and fell to his death, according to sources.

Simpson was rushed to Mount Sinai Beth Israel hospital where he was pronounced dead.

Investigators say foul play is not suspected, sources said.

All those who police interviewed admitted to drinking alcohol that night and cops reported a strong odor of booze on those involved, sources said.

A rep for the Permanent Mission of Australia to the United Nations did not immediately respond to a request for comment.

An official at the Australian Consulate-General New York said when reached by phone, "We have no comment at the moment."