When Fabrice Muamba collapsed on the pitch the whole stadium fell silent and stood still. Apart from this man, who will now forever be known as the doctor who came to the footballers aid.
Here he describes just how he came to be on the pitch.
Fabrice Muamba has been discharged from hospital, almost a month to the day after he suffered a cardiac arrest during a game.
The fiancee and family of Fabrice Muamba have said thank you for the support they have received following the footballer's heart attack.
Footballer Fabrice Muamba showed "signs of improvement" today after his heart started beating without the aid of medication.