He attended the Phrontisterion of Trapezous, a Greek middle level school in Trebizond.
He was one of the notable figures of Pontus region hanged by the Turkish nationalists of Mustafa Kemal. Kapetanidis also published his own newspaper Epochi (Season). He got also involved in educational issues, supporting the use of vernacular Greek in the local schools.
Kapetanidis was hanged in Amasya, in September 1921, by the Turkish nationalists under Mustafa Kemal (later Ataturk) during the Pontic Greek Genocide.
He was among several other notable figures of the local Greek community hanged there.
After graduation, he became one of the most prominent journalists and active members of the local Greek press