Fall
In 1540 King James became convinced that Hamilton was plotting against him, although no evidence for this was presented. Arrested on charges of treason in late July, on 16 August Hamilton was tried, convicted and executed. Amongst the charges presented on 16 August, were these, which dated back 12 years, and suggest concerns about the security of the royal bedchamber;"Sir James Hamilton of Finnart, having been convicted of the treasonable shooting of guns and firing of missiles outside the palace of Linlithgow and from the bell-tower of the same, at the king and the people in his company, both at the time the king came to the palace and when he withdrew from the same, and especially at his lodging place in the same town, the king being personally present at the time of the firing of the said missiles. And for art and part in the treasonable imagination, planning, and consultation, vulgarly called devising, of assassinations, at the time it is said he was with Archibald Douglas of Kilspindie and James Douglas of Parkhead at the chapel of St Leonard near Edinburgh, after the forfeiture of Archibald Douglas, formerly Earl of Angus, George Douglas of Pittendreich his brother, and the said Archibald Douglas, his father, and also during the siege of Tantallon Castle in consultation with the said Douglases, how he would enter by the window near the upper part of the bed, 'the bedhead' (superiorem thori - literally above the pillows), in the King's palace near Holyrood Abbey, and how there he would commit the slaughter of the King. And for common treason and conspiracy against the King, his realm and lieges. Therefore it was given that this James forfeited his life, lands, rents and possessions to the king as his escheat, to remain with him in perpetuity."
After Finnart was beheaded at Edinburgh, James V seized Craignethan Castle. He installed a garrison led by James and David Orrok. The silverwork from the chapel was taken to Edinburgh and engraved by John Mosman with the arms of the king's infant eldest son, James, Duke of Rothesay. James V redeemed two silver flagons from Mungo Tennant, a merchant who had lent Finnart money which he used to pay for hauling timber to the building work at Stirling Castle.
A chest with Finnart's papers was brought to Edinburgh, and many of these were destroyed by crown officers. Cardinal Beaton gave money to his widow, as she was his relative.
After his death, Finnart is said to have appeared to James V in a dream, and declared that he "would shortly lose both arms, then his head." This prophecy came true, as the King lost both of his young sons in 1541, and died himself in 1542. The story was recorded by John Knox and George Buchanan.