Prime Minister Anwar Ibrahim has urged a thorough investigation with no compromise into the death of Noorizwan Zulkefly, 42, who died while in police custody.

Anwar said he had instructed his officers to accept a letter delivered by the late Noorizwan's family to his residence in Sungai Long, Kajang, today.

He added that he had informed Inspector-General of Police Khalid Ismail regarding the matter.

"I am scheduled to attend several events in Malacca today and have delegated my officer to accept the letter as well as listen firsthand to the concerns raised by the family.