The legal defense fund for accused CEO assassin Luigi Mangione has raked in well over $500,000 in donations by Friday — as he is due in court for his first hearing since being slapped with murder and terror charges. Donations have been pouring in to help pay for the 26-year-old alleged killer’s legal fees ever since he was arrested in December over the cold-blooded killing of United Healthcare CEO Brian Thompson outside a Manhattan hotel. As of early Friday, the online fundraiser had reached its target, having topped $514,500 — with the goal now raised to a staggering $1 million.