Ortom made the promise in a statement by his Chief Press Secretary, Mr Terver Akase on Wednesday in Makurdi.
Ngugban, the assistant parish priest of St. Paul Catholic Church, Aye-Twar village in Katsina-Ala Local Government Area, was killed on Tuesday inside the Parish house.
Ortom who condemned the act, assured that the killers of the priest would be brought to justice.
The governor described the attack as “mindless and wonders why a harmless priest would become the target of armed men.”
Ortom sympathised with the bereaved family and prayed that God grants the soul of Ngugban eternal rest.