His death was blamed on fever , although the speed of his death and his age , thirty - six , made many suspect poison .
In 1625 the 2nd Marquis died at Whitehall of a seizure .
Marquis ' death was blamed on fever , although the speed of his death and his age , thirty - six , made many suspect poison .
In 1625 the 2nd Marquis died at Whitehall of a seizure .