As fast as Peter III lost Russian sympathy by his open aversion to everything Russian, Catherine ingratiated herself by exactly opposite behaviour. After half a year of the reign of Peter III, Catherine was raised by the guards officers to the throne. The brother of her favourite Count Grigory Orlov, Aleksey, killed Peter on July 18 (New Style; July 6, Old Style), 1762.
Wikipedia: Catherine the Great
Britannica: Legacy of Catherine the Great
Britannica: Catherine the Great