Is my turtle dying

by Cindy
(Orange county Ca.)

I found a desert turtle 3 years ago in a alley. I have tried to care for it but it seems to be sick. He doesnt move to much and seems to be blind. When food is presented to him he moves his head around and opens his mouth but is missing it. His face is peeling and his eyes are a little sunken in. I dont know what i should do.I hand feed him and he will eat when I do this. Here is a picture of him (I think its a boy anyways) His name is Leo. I live in orange county ca. He has a large area in my backyard and he hybernates in a dog igloo now. He did dig a burrow the first year but not anymore. I have no idea how old he is. He has a hole in his shell and I think he limps. My husband said he was probably abused and that someone most likely threw him. It is so hard to imagine that someone would do this. Any insight you can give me would be wonderful.
Thanks,
Cindy
ps the red on his mouth is from watermelon he really enjoys this!