Disqualifications (National Assembly)
Section 66(1)(c) · 1999 Constitution (2004 edition)
What Constitution says
(c) he is under a sentence of death imposed on him by any competent court of law or tribunal in Nigeria or a sentence of imprisonment or fine for an offence involving dishonesty or fraud (by whatever name called) or any other offence imposed on him by such a court or tribunal or substituted by a competent authority for any other sentence imposed on him by such a court;
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 47–48. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections