New York Post HUSBAND IN FIERY KIN-SLAY HORROR By JOE McGURK and LARRY CELONA A Lower East Side man tried to massacre his family last night — killing two and wounding two others — before setting the apartment ablaze and dying in a gas explosion, police said. The violence erupted on the 21st floor of 87 Columbia St. at around 8 p.m., when the killer's wife, Chou Zhang, returned home with her 29-year-old nephew and 19-year-old son to find her husband acting deranged, police sources said.