Why did Jotaro's Star Platinum's punch destroy DIO's The World? Towards the end of episode 48 of Star Crusaders, Dio kicks at Jotaro who uses Star Platinum to punch The World's shin. Star Platinum's fist ends up cracking, but then The World's entire body ends up cracking, killing DIO in the process.

How could this simple punch kill The World?
Remember when Joseph and Avdol meet Jotaro in jail and told him that Stands were a manifestation of life force? That's the same principle of hamon and that's the reason DIO isn't immune to them.
here's the explication in youtube
And for completion sake i'll add a quote from the author itself: