Police will submit investigation papers into Noorizwan Zulkefly's custodial death to the Attorney-General's Chambers on Wednesday, amid mounting demands from his family and lawyers for the case to be investigated as murder.

Bernama reported that Bukit Aman Criminal Investigation Department (CID) director M Kumar confirmed this today, nearly five weeks after the 42-year-old's death while in custody for 10 days at the Cheras district police headquarters.

The investigation is being conducted under Section 331 of the Penal Code, which concerns voluntarily causing hurt to extort a confession or information, despite repeated calls by Lawyers for Liberty (LFL) for the case to be classified as murder under Section 302.