On March 18 , 2011 , Comedy Central aired a special called Give it up for Greg Giraldo , that featured celebrities Jon Stewart , Colin Quinn , Lewis Black , Daniel Tosh , Denis Leary , Sarah Silverman , Jeffrey Ross , Nick Swardson , Dave Attell , Jim Gaffigan and Conan O'Brien as well as others as they talked about his life and career . On March 18 , 2011 , Comedy Central aired Give it up for Greg Giraldo , a one-hour television special honoring his memory in which multiple comedians , including Jon Stewart , Nick Swardson , Colin Quinn , Denis Leary , Sarah Silverman , Dave Attell , Tom Papa , Lewis Black , Daniel Tosh , and Conan O'Brien , talked about his life , career , and memories of him .