Grantham was a member of the Metropolitan Police Force which had been formally established in 1829. While on duty on June 28, 1830, he tried to intervene in a fight between two drunks in Somers Town, London. At his inquest, the jury returned a verdict of "justifiable homicide", possibly due to suspicion of the new police force. Grantham was held to have contributed to his own death by "over-exertion in the discharge of his duty".[1][2]
