The group Eliminating Deaths and Abuse in Custody Together (Edict) has demanded a coroner’s inquest to investigate the death of Surendran Shanker, who died while being held under a law that allows for detention-without-trial.

Edict said no one should die in detention and all parties must work together to put an end to such deaths.

“Edict is disappointed with the frequency of such deaths in custody, which the...