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harrowing days in our history. the attempted assassination of president reagan. >> screaming, yelling. it's chaos. >> now, an unprecedented look into the mind and new life of the gunman, john hinckley junior. stories you haven't heard before. the cop, who questioned him, speaks out in his first nationally televised interview. >> i just didn't think he realized the magnitude of what he had done. >> from behind the hospital walls. he >> turned to her and said, will you marry me? >> secrets from his diary uncovered by dateline. his obsession with actors, jody foster. >> the letters were...

>> from behind the hospital walls. he >> turned to her and said, will you marry me? >> secrets from his diary uncovered by dateline. his obsession with actors, jody foster. >> the letters were sent to -- >> and the most controversial question of all, is hinckley really fit to be free? >> he's a potential k -- dangerous character. ♪ ♪ ♪ >> hello, welcome to dateline. he shot a president and shook the country. since that day, more than 40 years ago, gunman, john hinckley jr. has remained an enigma. now, we're about to reveal an extraordinary trove of his most private thoughts and...