my game says Kenny died too. He slapped me on my back and made me drop the radio. I thought it might still be important in finding Clem, so while we argued about who should go down and get it, Christa jumped down in the hole.
She couldn't reach us to pull her back up, and grabbed a metal pole. When she slid off and we dropped the pole, a bunch of walkers who were standing in the room the whole time suddenly realized she was there. Kenny jumped down to give her a boost, then ran off into the darkness shooting. I didn't know if he took a couple of them with him, shot himself, or found an alternate exit until the ending says he died. Kind of the same thing with the hobo. He says "i'll catch up with you later" and I just find him dead randomly in the sewer. Kenny says "I'll find a way around", and isn't seen or heard from again.
Honestly, I wouldn't have bothered about getting it back if I knew the radio had no bearing on anything anymore. Seriously, it didn't come into play once after Clem managed to tell us she was OK.
(Presumably) Kenny got killed for no reason. Bastards.