There are no words. I cannot fathom what the parents of the two Columbine murderers have gone through. First, your sons planned a horrific crime and carried it out killing others. Second, they ended their own lives. Although there are indications the parents have not reacted the same. In this case, the mother of one of the shooters (who will remain nameless - she identifies herself) gave a TED Talk.
I found it poignant and worth sharing. It was made public last week.