PORT-AU-PRINCE, HAITI - JANUARY 17: (IMAGE RELEASED BY U.S. MILITARY) In this handout image provided by the U.S. Navy, members of the Los Angeles County Fire Department Search and Rescue Team clear debris at a collapsed building January 17, 2010 in Port-Au-Prince, Haiti. Planeloads of rescuers and relief supplies headed to Haiti as governments and aid agencies launched a massive relief operation after a powerful earthquake that may have killed thousands. Many buildings were reduced to rubble by the 7.0-strong quake on January 12. (Photo by U.S. Navy via Getty Images)
His twin brother, Gregory, told Newsday it's believed his brother was meeting with the head of the U.N. mission in Haiti when the building collapsed last week. The U.N. spokesman said Grene was among some 40 people killed at the headquarters building.
U.N. officials say scores of other U.N. workers in Haiti are missing.