FORMER police commando Sirul Azhar Umar, who was convicted of the murder of Mongolian Altantuya Shaariibuu, has sent a private letter to Prime Minister Dr Mahathir Mohamad.

The letter was sent through former Batu Kawan Umno chief Khairuddin Abu Hassan, who visited the convicted killer at the Villawood Detention Centre in Sydney, Australia, today.