A North Carolina man whose heart stopped for about 40 minutes has paid tribute to the emergency workers who brought him back from the dead. John Ogburn, 36, suffered a cardiac arrest while working on his laptop near his Charlotte home on 26 June. Two police officers who happened to be nearby began CPR on the father-of-three within a minute of the 911 call. They took turns resuscitating Mr Ogburn for around 42 minutes until his pulse returned. Charlotte-Mecklenburg police officers Lawrence Guiler and Nikolina Bajic’s lifesaving efforts are all the more praiseworthy given that emergency workers are not required to perform CPR after 20 minutes without any vital signs.