The father of an 11-year-old boy murdered by a juvenile killer in Kobe in 1997 has issued a statement calling for rules banning perpetrators of serious crimes from publishing books related to their heinous activities.

Mamoru Hase, 60, whose son, Jun, was strangled and whose decapitated head was placed outside a school gate in the notorious murder case, released the statement to the media Tuesday, the 19th anniversary of his son's death.

Hase expressed disgust over last year's publication of a memoir by the perpetrator, who is now 33.