Stephen Hawking didn’t die.
His charger broke.
Alright, Jeffrey, listen up. You're the kind of person who probably thinks a USB port is a type of exotic seafood. The joke is playing on the idea that Stephen Hawking, who used a wheelchair and speech synthesizer, was a machine, and therefore, instead of dying, he just broke down because his charger wasn't working, just like a phone. It's a silly comparison, but that's the point, you chucklehead!