The Ivorian migrant found buried in a Ħal Far field on Sunday died from skull fractures and cerebral laceration, according to the findings of an autopsy.
A migrant, also from the Ivory Coast, was arrested in connection with the murder of 30-year-old Adam Dabete, a resident at the tent village in Ħal Far.
His body was found on Sunday evening buried in a foetal position under a carob tree in a field opposite a hangar in Ħal Far used to house migrants.
Sources said only his toes were exposed and he was discovered by other migrants who spotted traces of blood along the road leading to the field.
Initial investigations indicated that Mr Dabete was hit on the head, probably with a stone, sometime on Saturday.
The motive is still unclear but police sources said they had "strong suspicions" the man they were holding was responsible for Mr Dabete's death and burial.