CNN : Expert : The caller is saying ` ` there 's a reason '' sudden violence happens . NPR : Radio show host says the idea he may have talked to a mass killer is ` ` chilling '' Adam Lanza may have called a radio show in 2011 , N.Y. Daily News reports . The caller talks about a chimp 's attack on a human , ` ` random acts '' of human violence .
NEW : Expert : The caller is saying `` there 's a reason '' sudden violence happens . NEW : Radio show host says the idea he may have talked to a mass killer is `` chilling '' Adam Lanza may have called a radio show in 2011 , N.Y. Daily News reports . The caller talked about a chimp 's attack on a human , `` random acts '' of human violence .