a deal's a deal. >> back at kentucky state penitentiary, randy haight made it clear. holton. but he's ready for it, nonetheless. >> i'm extremely sad for what i've done. it hurts me knowing that i went to the level that i went. and if there was any way possible for me to be healed or correct it, believe me, it would be done. it's an impossible situation not only for me but for everybody involved, you know? and i'm not saying that to get out of an execution or -- because like i said, i'd ready. if you want to kill me, let's go. i'm ready to go. but i think that i have something i can offer somebody. and i don't think it's really time for me to die. >>> this sunday, mass murder in the air. the latest on the germanwings pilot. what medical condition was he hiding and are changes needed in the way we screen commercial airline pilots? >>> plus, as talks on a nuclear deal with iran reach their final hours -- >> for first time, u.s. officials are talking about what will happen if all of this fails. >> -- how the u.s. is becoming caught up on both sides of a proxy war between