It is unknown if Johan Hamel was married or not. He is a private person and he spoke less about his relationship.
On March 6, 2011, Johan made his professional debut directly in Ligue 1, the highest football league in France, in a match between Olympique Marseille and Lille.
He officially became a referee of 136 Ligue 1 matches. He was also the referee of 86 Ligue 2 matches.
His last match as a referee was the match between Lille OSC and Rennes on November 6, 2022, and on November 13, he was a video assistant referee of Paris Saint-Germain against Auxerre.
A few days later on November 15, he died from a heart attack during training at the age of 42.