None. I don't know this guy, I have no idea if he deserves my help. Ok, I might give a little, I did just win a couple of million dollars(I think it's still 2.2 dollars to a pound or more) so I might give like, 10 thousand. But certainly nothing substantial.
I never really saw the value of random charity. Random self-sacrifice(and that's what this is, no matter how minimal the sacrifice) is slavery to any fool who thinks they deserve what you earned with your hard work or good luck. If I knew this person, or at least had heard on the news of what had happened and I came to the logical conclusion that they deserved help, then I would give more. 50-100 thousand or more. But I'm not just going to give money to some smuck who needs it to save someone elses life.
Maybe he wants to hire a good enough lawyer to get some serial rapist/killer off deathrow, or something almost as bad. Maybe he just wants to save some moron who's been on welfare their whole life, who will continue to not work, and will be nothing but a leach on society for their entire existance.
The value of life is what you do with it. Your life is yours alone. Rise up and live it.