The lawyer for the family of deceased Nigerian national Thomas Orhions Ewansiha has urged the police to submit investigation papers as soon as possible in order for an inquest proceeding to get underway.

In a statement today, lawyers Rajesh Nagarajan and Sachpreetraj Singh Sohanpal said it has been four months since the deceased passed on and the Coroner's Court cannot investigate his death until it received the documents.

"Upon being queried, the prosecution division of the Attorney-General's chamber confirmed that the investigation papers are yet to be completed as investigations are still ongoing as stated in their letter dated Oct 25 to our firm.

"It is truly appalling that investigations have not been completed despite the fact that almost four months have passed since Mr Thomas' death," said the two lawyers.

Thomas, 34, was detained by Immigration Department personnel at an apartment in Kepong, Kuala Lumpur on July 4 despite having valid papers.

The Immigration Department claimed that he was found dead on July 9 after suffering from seizures while sleeping.