An underground gig in Malacca turned tragic when a 21-year-old participant sustained serious head injuries during a mosh pit before dying in the hospital four days later.

Police have reclassified their investigation into the Oct 17 incident at an event space in Kampung Jawa, Melaka Tengah, from causing grievous hurt by dangerous weapons or means to murder under Section 302 of the Penal Code.

Melaka Tengah district police chief Halim Abas said the victim, a parcel delivery worker, suffered serious injuries to the back of his head and was sent to the Malacca Hospital.

"The victim received treatment at the hospital’s intensive care unit, where he died at 3.53pm on Oct 21.