Please make him realize that he'll hurt his family even more if he takes such a step, honestly nothing is new under the sun, yes! the deed has been done and they found out about the money (which to me was inevitable, cos even if the current issue didn't come up, he would still have to replace the money he used in the first place), however suicide is never an option, would killing himself help pay the money he owes? Would it help save face with his family?? No!.

He just needs to realize that it has happened already, the next thing is to think about a solution, his family might be angry at him now,but it's just in the heat of the moment, i'm sure with their anger they won't want to see him dead, suicide does more harm than good, it should never be an option.