It happened like 2 years ago. I was playing minecraft on survival mode, no multiplayer or anything, just me. Then I fell into a cave, like a vertical entrance to a cave but there was another player with skin like an indian, no shirt wearing a mask and began to attack me with a bow. I died but I thought it was something normal because I didn't had much time playing minecraft.
After two and a half years I tried looking if it appeared again but it didn't and I searched and searched if anyone out there had experienced that or what kind of mob was it.
Too bad I couldn't take a picture.
And two finale things: no, I'm not trying to troll or anything and second, no it wasn't Herobrine.
Added (1). Ah! And it wasn't a zombie either, it was still daylight and didn't have armor, like just a man with no t-shirt.