The company said he collapsed yesterday evening while playing five-a-side football and died shortly afterwards in hospital despite attempts to resuscitate him. He was 39.
In a statement the Scottish dealer group said: "John had worked in all aspects of the business in gaining a thorough understanding of every critical area. He was fondly regarded and greatly respected by all who worked with him closely, not only within the John Martin Group, but with franchises and strategic partners alike. John’s passing is a huge blow to our staff with whom he was held in the highest regard."
John Martin Snr is chairman of the company.