Minecraft: weird person in underground?

I play minecraft 1.7.10. I play singelplayer When i mine i found another path and inside it i found a man holding something like bottle, when i chased him i killed by monster, can anyone tell me who he is?
The map already deleted and no photo.

Guest

Ah, sounds like you encountered a witch! Did he/she look like this?
more info here=

Shinjite

Unless you are modded, that will almost certainly be a Witch.

Thomas S