RIP: The Undertaker retires from WWE after brutal Wrestlemania 33 match

The Undertaker Retires From Wrestling

Wrestling icon Undertaker makes shock return at non-WWE event

Undertaker: The (sting) match would've been good, but it would not have lived up to the expectations. People were thinking Undertaker 2007/08 vs Sting, I can say when he got there, I was way on the backside"