Punch on Monday gathered that Mrere was murdered on Saturday night on Owerri- Port Harcourt Road in Owerri.
A senior officer of NIS, who confirmed the incident, said the slain officer’s corpse was discovered in a bush on Sunday morning.
Mrere was riding a Hilux van belonging to NIS when he was allegedly waylaid, shot and killed.
A source who doesn’t want to be mentioned said the assailants did not take the victim’s service pistol as it was found on him when his corpse was discovered, the next day.
The official Hilux van that he was riding when he was attacked was riddled with bullet holes.
The source said, “The chief provost of Nigerian Immigration Service, Imo State Command, Okiemute Mrere, has been assassinated. He was killed on Saturday night. He was riding in his official Hilux van when he was attacked, shot and killed.