https://thehistoryofparliament.wordpress.com/2019/01/30/execution-of-charles-i-%EF%BB%BFking-killer-the-making-of-a-regicide/

At this link:

Execution of Charles I – ‘King-killer’: the Making of a Regicide – The History of Parliament (wordpress.com)

17TH CENTURY HISTORY, EARLY MODERN HISTORY, JAMES I TO RESTORATION

Execution of Charles I – ‘King-killer’: the Making of a Regicide

"In the fourth in our series on the tumultuous events of the winter of 1648-9, and following on from the trial of Charles I, we turn now to the consequence of a guilty verdict.  Dr Patrick Little of the House of Commons 1640-1660 considers the process whereby one MP became a signatory to the death warrant for Charles I, executed at Whitehall on this day 370 years ago, 30 January 1649…

King Charles I’s death warrant was signed on 29 January 1649 by 59 men; no doubt there were 59 individual reasons for doing so.  One might mention the army radicals, such as Oliver Cromwell, committed republicans, including Henry Marten, or religious zealots, like Sir John Bourchier, or Edmund Ludlowe, whose rationale for ‘Delivering justice’ was quoted in the previous post in this series.  But rather than attempt to provide a group portrait, this post concentrates on the experience of one man, Sir Hardress Waller.  How did a fairly unremarkable country gentleman become a king-killer?"