User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-168.169.25.92-20150930195000/@comment-24834479-20150930234603

1. Frank was killed. 2. Unless it changed in the show later on for plot purposes, yes, Chuck is God. 3. Yes, Death is dead. 4. Castiel knew who Cain was due to his importance, and Cain knew who Castiel was through his involvement with Dean.