The dead brother had a tattoo that made him match the desc of a bad guy.
The feds tortured this brother to death in jail and we still have seen NONE of the OKC Murrah Bldg surveillance tapes that show the arrival of the bombers.
Short version is the FBI KNEW the Murrah Building was going.to be bombed and they blew the sting that might have stopped it.
The ATF/FBI got greedy, wanted not just to convict but instead wanted to dramatically catch them ALL right int the act, yet the final timing timetable got changed at the last minute and the blast went off fine.
So the US government had to kill the citizens who knew, because it was An Enormous Scandal.