Friend is on social media looking on tips to reach a celebrity to grant a dying person's wish. I sent a few things I've done in the past with wrestlers and actors that have responded to me. Essentially, if Batman isn't answering, Tweet Robin. If it's someone that catches a lot of negativity, send something positive that'll stand out.
She just PM'd me the specifics, her friend is a caregiver for a terminally ill Metallica fan and they're trying to get the members of Metallica to send something to the fan, outside of Cameo type settings. The biggest thing that's keeping them pessimistic is that the patient's an adult and not a child "feel good" situation (their words). I said Lars can't be TOO hard to reach, just send him something positive, ANYTHING positive that'll stand out against all the angry 43 year olds still bitching about Napster. "Hi, Lars, big fan, but I know an even bigger fan that could use some encouragement from you and the guys..." could go a long way.
I'm welcoming any ideas y'all can throw this way for me to pass along. As of right now they're trying to get in touch with the booking agent for the band. My friend and her spouse both have some show biz connections but Metallica is a little bigger than their usual dealings.