If your rights have been restored, yes. However, executive clemency normally applies to federal felony charges, and you can only get your rights restored if you have state level felony charges.
Yes, Mrs. Windsor has signed Death Warrants since she became the unelected Head of State of the United Kingdom and British Colonies and Territories in 1952 and she continues to do so. Notably, she signed the Death Warrant upon black British revolutionary, Michael X in Trinidad in 1975. Although Capital Punishment was abolished in the UK in 1969, Mrs. Windsor continued to sign the Death Warrants of her 'subjects' in former colonies, where, despite them having independence, Britain retained judicial control of these countries through the ‘Privy Council’ in London, yet did not rescind the Death Penalty in those nations. In 1999, Mrs. Windsor signed the Death Warrants of a plethora of people, thus authorising a ‘mass hanging’. Mrs. Windsor has continued to sign Death Warrants ever since. She reportedly revoked the appeal for clemancy of one man, and signed the Death Warrant, because he had killed his dog.