Mr Boorman (pictured) had previously served as managing director, chief executive and chairman of the company, which owns a portfolio of weekly newspapers, websites and radio stations across Kent. He had also served as Kent Messenger editor.
He took on the role of president in January 2006, passing the chairman's baton to his daughter Geraldine.
Mr Boorman is a former president of the Newspaper Society, serving from 2001 to 2002. He was awarded an OBE in 2002 for his services to the Royal British Legion in Kent.
He had been taken ill just before Christmas, and passed away peacefully on Wednesday night.
KM Group managing director Richard Elliot paid tribute to Mr Boorman, whom he described as "a great figure with a true passion for local journalism".
He added: "Edwin helped build a company that everyone at the KM Group is proud to work for, and we will all miss him greatly. Our thoughts and best wishes are with Geraldine and all the family."
Mr Boorman was the third generation in a family that has owned the business since the late 1800s. Under his leadership, the KM Group expanded into radio and digital with the launch of kmfm and kentonline.co.uk. Its newspaper portfolio includes the Kent Messenger, Medway Messenger, Kentish Gazette and Kentish Express.
He leaves five children and seven grandchildren.
