PHILADELPHIA (CBS) — A top official in the Philadelphia District Attorney’s Office has announced his resignation.

Tariq El-Shabazz, who was deputy of investigations and first assistant district attorney, submitted his letter of resignation on Monday.

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“Mr. El-Shabazz did submit his letter of resignation to the District Attorney, effective close of business today,” said office spokesperson Cameron Kline.

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This comes after Philadelphia District Attorney Seth Williams announced Friday that he will not be seeking re-election for a third term following an ethics investigation where he was fined over $60,000 for not reporting sources of income and accepting gifts.

A longtime friend and confidant of Williams, El-Shabazz served as his chief lieutenant for six months, working on special investigations including insurance fraud, drug and cyber crimes.

Before his role in the district attorney’s office, El-Shabazz worked as a criminal defense attorney and has been a lawyer for 28 years.

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El-Shabazz began working for the district attorney’s office in August 2016.