Cholmley Turner’s nephew Sir Charles Turner, 1st Baronet, of Kirkleatham, MP for York from 1768 to 1783, continued building upon the estate.
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The mausoleum was built in 1739–40 by James Gibbs, and restored with added internal cladding in 1839.
McWilliam died 1 October 1951 in Redcar and is buried in the nearby Kirkleatham cemetery.
He was the son of Sir Charles Turner, Bt of Kirkleatham Hall, Yorkshire by his second wife Mary, the daughter of James Shuttleworth of Gawthorpe Hall.