During the Wars of the Roses he allied himself with the Lancastrian side, and after the Yorkist victory in 1461 was charged with treason and beheaded on Tower Hill on 23 February 1462.
As an ally of Suffolk, Tuddenham was the recipient of numerous appointments and grants in East Anglia and in the household of Henry VI.
[8] Nevertheless, Tuddenham and Heydon's political influence "never again reached the same heights it had done in the 1440s", and it was not until March 1455 that both men were reinstated as Justices of the Peace in Norfolk.
[3] Edward IV came to the throne after the Yorkist victory at the Battle of Towton on 29 March 1461, and shortly thereafter an order for Tuddenham's arrest was issued, and his estates were confiscated.
[15] The executions were recorded in several chronicles of the period, one of which contained the following account:[16] And the 12th day of February the Earl of Oxenford and the Lord Aubrey Vere, his son, Sir Thomas Tuddenham, William Tyrrell and other were brought into the Tower of London.
And the 23rd day of the said month of February Sir Thomas Tuddenham,[17] William Tyrrell, and John Montgomery were beheaded at said Tower Hill.
[3][18] His lands, including his manor of Oxburgh, were inherited by his sister, Margaret Tuddenham, who had married Edmund Bedingfield, Esquire.