This discussion may contain spoilers!
Ok so some people still think that Lee is still alive somehow but I have proof he's 100% dead. Ok so in the scene where you talk to Luke and tell him your story Luke asks (referring to Lee) "What happened to him?" If you shot Lee in episode 5 then you have an option to say "I killed him... he got bit protecting me and I had to shoot him so he doesn't turn... I had to." or something along those lines. So it's clear that Clem didn't possibly miss and shoot the wall and ran away because she says herself that she killed him. So there you go Lee is dead, if you still think he's alive I'd like to see some proof lol