As his father did before him, Leeke represented Cambridge University in the hammer and shot put and was English Amateur Champion for both events.[4] He was associated with the London Athletic Club.[3] In 1898, he married Catherine Herbert, younger daughter of Charles G. Fullerton. They had one son and one daughter and resided in Hill, Warwickshire.[4]
One of the first British athletes to throw the discus, he set a British record in 1908.[3] During the 1908 Olympic Trials, Leeke threw the javelin 135-81⁄2 (41.37m) in the freestyle event.[3]
Shortly after the outbreak of World War I, Leeke joined the Royal Warwickshire Regiment, he was granted a commission as a temporary lieutenant on 22 September 1914,[9] and placed in charge of machine guns for D Company, 9th Battalion. He died of fever at the Thornhill Isolation Hospital, Aldershot on 29 May 1915 aged 35.[4] He is buried in Aldershot Military Cemetery.[10][11]