In 1806 poverty forced Lambert to put himself on exhibition to raise money. In April 1806, he took up residence in London, charging spectators to enter his apartments to meet him. Visitors were impressed by his intelligence and personality, and visiting him became highly fashionable. After some months on public display Lambert grew tired of exhibiting himself, and in September 1806 he returned, wealthy, to Leicester, where he bred sporting dogs and regularly attended sporting events. Between 1806 and 1809 he made a further series of short fundraising tours.
In June 1809 he died suddenly in Stamford. At the time of his death he weighed 52 stone 11 lb (739 lb; 335 kg), and his coffin required 112 square feet (10.4 m2) of wood. Despite the coffin being built with wheels to allow easy transport, and a sloping approach being dug to the grave, it took 20 men almost half an hour to drag his casket into the trench, in a newly opened burial ground to the rear of St Martin's Church. While others have since overtaken Daniel Lambert's record as the heaviest person in history, he remains a popular character in Leicester, and in 2009 was described by the Leicester Mercury as "one of the city's most cherished icons".