In 1655, he purchased Ballyvarra Castle and later, in 1659, settled at Croagh, County Limerick, Ireland, managing an estate worth £800 per annum, along with lands in Lower Conneloe.
[3] In 1672, Walcot was arrested on suspicion of aiding a Dutch invasion of Ireland but was exonerated after eight months in the Tower of London.
In July 1683, Walcot was implicated in the Rye House Plot, a conspiracy to assassinate King Charles II and James, Duke of York.
[4] His remains were hanged, drawn, and quartered, with his head displayed at Aldgate—marking him as the last person in England subjected to this punishment.
His attainder was reversed in 1696, restoring his legacy to his eldest son, John, under King William III of England.