A building on More Road, Ile-Ife, Osun State, was late on Saturday night destroyed by suspected explosives.
It is said to house Ebenco Pharmacy.
The Nation learnt that sympathisers allegedly found an unidentified middle-aged man beside the debris in a coma and took him to Obafemi Awolowo University Teaching Hospital, Ile-Ife where he died.
A source said the incident occurred around 11p.m.
He said there was a loud noise and a heavy dust.
It was gathered that there was a controversy over the ownership of the house after the death of the owner.
Policemen were on the scene of the collapse last night.
A town planner, Kunle Olagbaju, has called for investigation.
He said the manner the building caved in without a warning was an indication of a security threat that must be prevented in future.