Of six shots fired, Reagan was hit, as well as Press Secretary James Brady, D.C. Police Officer Thomas Delahanty and Secret Service agent Timothy McCarthy.
The tapes indicate Secret Service agents weren't aware Reagan had been shot when he was whisked away in his limousine until the president began bleeding from the mouth.
The crackly audio tells of agents reporting "Rawhide," Reagan's code name, was OK and they were headed back to the "Crown," or White House.
About a minute later, the agent driving says in a very calm tone they were diverting to George Washington University Hospital.
Reagan walked into the hospital but collapsed as doctors were initially unaware he'd been shot.
The Secret Service audio link is at: www.secretservice.gov/press/Reagan_Radio_Traffic.mp3.
The transcript of the recording is at: http://www.secretservice.gov/press/GPA02-11_CommandPostAudio.pdf.