On his return to England in 1763, he died of fever in Madrid, unmarried and childless and was buried in Westminster Abbey two months later. His father died only a year later and the titles became extinct.
Following his return to England in 1763, he met with an untimely demise due to fever in Madrid, never having married or produced children. He was laid to rest in Westminster Abbey two months after his passing. His father's death a year later led to the cessation of the family line.