and david joins us live mr. logan circle. >>reporter:10 months from now it will be a,6qp sea of humanity. more than a million pack the parkway as they try to get a glimpse of the pope. this is big as mayor nutter said this morning. >> this is a massive undertaking, again, not because of the volume of people that we should anticipate but because of the participants. >> participants number one is the pope himself. last march they went to rome to meet with the pope and urging them to meet with the world meeting of families in philadelphia. he secretly told him that he would be here. they could not say anything until the announcement. that announcement came this morning. he sent a letter to be read at the news conference in philadelphia. >> this moment is a historic and exhilarating one for all of us to share. it's the answers to countless prayers of so many people that asked god to guide pope francis to philadelphia. >>reporter:they pack the parkway on two we coulds november 26t t. it's a challenge for the law enforcement agenci

. >> everything we've been able to learn from talking to family and friends of mr. loganway he was. >> reporter: on the video you can see another patient adam lynn who runs out to help. but the automatic doors lock him in. >> outside of my reach to help where nurses laying in the hallway, and a guy beating one of them with a big medical device report roar another camera shows logan outside the unit as he continues his vicious attack. even coming back to strike a nurse. eventually logan runs out of saint john's hospital where deputees try unsecond says physical to taser him. >> there was a brief struggle as we've indicated he was handcuffed and moments later he went unresponsive. >> logan was brought back to saint john's hospital but he was already dead. six hours earlier, police were called to the hospital because the family was literally fighting over custody of logan. a sister contacting a lawyer to try to get an emergency order of protection. police say logan checked into the hospital three days earlier because he had become confused and paranoid after a routine surger