Photos surfaced online this week of WWE legend The Undertaker uses crutches when walking. It’s unknown which specific injury lead to the use of crutches. The former WWE Champion has dealt with numerous hip, knee, and back issues over the years.

‘Taker hasn’t appeared on WWE television since defeating Shane McMahon at WrestleMania 32 back in April. He’s been reportedly telling people backstage at WWE event for the last several years that he plans on retiring, but he hasn’t officially yet. The Undertaker, real name Mark Calaway, is currently 51 years old and has been on the WWE roster since he was 25.

Here are the photos snapped by fans over the last week:

Recent photo of #TheUndertaker on crutches. #WWE #Raw #Smackdown #Undertaker #Wrestlemania pic.twitter.com/lWCDSUhDbj

— Pro Wrestling & MMA (@ProWrestlingWW) October 12, 2016

Another photo of The Undertaker. You can see the crutches in his trunk which tells you it’s his. I hope he heals up soon. pic.twitter.com/teU8Lz0Axu

— Zack Lethal (@TheZackLethal) October 12, 2016