it was a moment that tony tung says he never expected. >> you hear the word "guilty" on murder -- >> le. unbelievable. >> reporter: though tony never took the stand during his trial, at his sentencing, two months later, he spoke publicly for the first time. i'm really for sorry what happened to robert cantor and especially to the two daughters of rob. ming from a father of three daughters, i could tell them that i didn't kill their father. >> reporter: as expected, no one on the cantor side of the courtroom was buying it. susan, rob's widow, spoke for the family. >> i think what the defendant leaves is a legacy of darkness and destruction, vengeance and cruelty. >> reporter: one of rob's colleague's also addressed the judge. >> please, please, please make sure he never sees the light of a day. >> reporter: when all was said and done, that is exactly what the judge decided to do. mr. tung, if you could please rise. as to count one murder, this court sentences you to life imprisonment. the no early release act will apply. >> reporter: tony tung faced his fate alone that day. his daughte