Multimillionaire banker Robert Kissel was poisoned with a milkshake in his Hong Kong high rise; his brother Andrew was beaten to death at his mansion in Greenwich, Connecticut. One brother was a smashing success, the other was a con artist. Both were sucked into a world of high-society scandal involving sex, drugs, and massive fraud on opposite sides of the world.

SOURCES: 

Never Enough Kindle Edition - McGinniss, Joe

Stamford Advocate

Developer Set to Plead Guilty Is Slain at Home - The New York Times

Father Dead, Mother Guilty, Children to Move Out West - The New York Times

Kissels Of Death -- New York Magazine - Nymag

Spotting & Stopping Financial Mismanagement - Fraud Alert - CooperatorNews New York, The Co-op & Condo Monthly

https://www.nytimes.com/2008/06/20/nyregion/20kissel.html

How a Co-op Lost Millions - The New York Times

Kissel driver pleads guilty to attempted murder