The person could only be someone Bruno teach about crypto and have confidence in the most within his family/friend after he left when understand perfectly well the chance of his surgery and here we see the person abusing Bruno's trust.
If it's family or a friend behind this then it's even worse. The least they could do would be to thank those who donated for the fallen Hero/brother/ father rather than come back to scheme for a way of scamming more Bitcoins.