reporter: rivers famous friends paying tribute on camera and online, as her family plans her funeral. still no word on all of the details but we re told the funeral will be here in new york on sunday. reena and tahman. marci gonzalez, thank you. as the investigation into joan rivers death begins, let s turn to managing editor of abc news medical unit dan childs. dan, good morning. thank you so much for coming in. of course, there are so many rumors out there about rivers death. what do we know for sure? there are few things we do know. what we do know is that joan rivers was at an outpatient clinic having some kind of procedure done. we then know the dispatch said she was undergoing cardiac arrest and taken to mt. sinai. where she was in critical condition for a while. put on life support. after that she was transferred to a private room. and after that she died. now obviously that leaves a lot of gaps in the middle. in terms of what goes in those