They say David was a longstanding and dedicated public servant who gave many years to Lewes and its residents, representing the town on both Lewes District and Lewes Town councils.
Over the years he represented communities including Lewes Castle and Lewes Priory during the 2000s and held a number of senior responsibilities, including serving as Chair of Lewes District Council from 2009.
Throughout his time as councillor, David was closely involved in the life of the town. Fellow party members describe how he worked on the practical social issues that make a difference to people's everyday lives.
His work included bringing the council, Sussex Police and local communities together to improve the local environment alongside the many other issues that came with representing his constituents over so many years.
His contribution to Lewes, both as a councillor and as a member of their local party, will be remembered by colleagues and friends with great affection and gratitude.
A LibDem spokesman said: "Our thoughts are with David's family, friends, former colleagues and everyone who knew him at this sad time."
Shirley Waymark said: "His funeral will be held on September 28 at Clayton Wood Natural Burial Ground at 11am. At the request of the family no flowers please - a collection will be held and if you can dress with nature in mind (flowery dresses) it will be in the spirit of David's love of nature. All are welcome."
His daughter Rachel Seaward said: "Thank you for the lovely tribute to my dad. He will be greatly missed."