He was one of the first members to join EOKA and was located in the Troodos Mountains. In a battle with the British Army in the area of Potamitissa on 17 February 1957, Stylianos Lenas was seriously wounded and captured. He died in Akrotiri hospital after 39 days on 28 March 1957. He was buried at the Imprisoned Graves in the Central Jail of Nicosia.