When did Vice President Spiro Agnew resign his office amidst a federal indictment?

Agnew resigned the vice presidency in October 1973, and came to US District Court in the city of Baltimore on the exact same day to plead "nolo contendere" to a single federal count of failing to report on his income-tax return $29,500 in income received in 1967, while governor of Maryland. Acknowledging that the plea amounted to a felony conviction, Agnew declared that he had resigned in the national interest. He was fined $10,000 and sentenced to three years of unsupervised probation. Spiro became the first Vice President in the US history to resign in disgrace. He was charged with bribery, tax fraud and conspiracy.