Father-of-four Naughton's death on Wednesday follows the loss of Mauro Poncini on Tuesday The rider, from the Isle of Man, was competing in his second Manx Grand Prix and died on Wednesday afternoon, organisers tragically confirmed later the same day Key points and original sources are listed below.

• Father-of-four Naughton's death on Wednesday follows the loss of Mauro Poncini on TuesdayS1

• The rider, from the Isle of Man, was competing in his second Manx Grand Prix and died on Wednesday afternoon, organisers tragically confirmed later the same dayS2