Police stated that a note was found in his wallet .
On 18 April , the rescued vice principal of Danwon High School , Kang Min - kyu , 52 , committed suicide by hanging himself .
Police stated that a note was found in vice principal 's wallet .
On 18 April , the rescued vice principal of Danwon High School , Kang Min - kyu , 52 , committed suicide by hanging himself .