In February 1462 the 12th Earl, his eldest son, Aubrey de Vere, and Sir Thomas Tuddenham, the 12th Earl's former political opponent in Norfolk and now a fellow Lancastrian loyalist, were convicted of high treason before John Tiptoft, 1st Earl of Worcester, Constable of England, for plotting against King Edward IV. The 12th Earl was beheaded on Tower Hill on 26 February 1462, and buried in the church of Austin Friars in London. His son Aubrey had been beheaded on the same scaffold six days earlier.