William of Moncrieff died between 24 Mar 1572 and Jan 1573 [3]
Sources
↑ The Church of Jesus Christ of Latter-day Saints [LDS], "Pedigree Resource File," database, Roots Magic Family Search (https://familysearch.org/ark:/61903/2:2:3S1C-KMP : accessed 2015), Mathew Moncriegge/Moncrieffe; submitted by Brown-Ebel.
Moncreiff-18 and Moncrieffe-5 appear to represent the same person because: same name, death of 1624 is correct, both are the 11th, same time frame and location, SPOUSE OF ANNE, DAUGHTER OF ROBERT MURRAY OF ABERCAIRNY, same parents, children are the same http://www.thepeerage.com/p27851.htm#i278509