[1] In 1949 Casey was elected Alderman and Commissioner of Public Safety over incumbent Louis J. Scanlon 19,677 votes to 19,551.

[1] While in the House, Casey supported legislation to give the Mayor of Boston more control over the Boston Police Department (including control over the department's budget and the power to appoint the Police Commissioner) and to construction roads that would provide Lawrence with access to I-93 and I-495.

[4][5] In 1964, Casey was appointed Sheriff of Essex County by Governor Endicott Peabody to fill the vacancy caused by the death of Earl Wells.

On June 4, 1964, the Massachusetts Governor's Council confirmed his appointed 7 to 0 and he was sworn in by Peabody that same day.

[6][7] Wells defeated Casey in the special election to fill his father's unexpired term, 136,860 votes to 135,185.