Nuhu Ribadu, a deputy police commissioner until his dismissal, won international respect as head of the Economic and Financial Crimes Commission (EFCC). But since being removed from that job last year he has fallen out of favour with the police.
"Ribadu took the path of indiscipline, confrontation and destruction never known before in the force, forgetting that discipline is the bedrock upon which the force rests," said police spokesman Udom Ekpoudom.
Some of Ribadu's acts of misconduct listed by the police included improper dress, absence from duty, and taking legal action against the government.
Ribadu was removed in December 2007 as EFCC chief and sent on a one-year course at a remote institute in central Nigeria.
He was replaced in June by Farida Waziri, a retired top ranking police officer handpicked by Yar'Adua.
Graft is endemic in Africa's most populous nation, from policemen at checkpoints demanding bribes to senior government officials accused of embezzling millions of dollars.
Campaigners say powerful former state governors, seeking to protect themselves against charges of fraud and money laundering, are trying to sabotage the fight against corruption.
Ten former state governors have been charged with graft since Yar'Adua took office, but only one has been convicted.
In August, Ribadu was demoted two ranks to deputy commissioner after the police deemed his promotion under the previous government as irregular.
Ribadu told Human Rights Watch earlier this month an apparent attempt had been made on his life in September and that he had since received threatening phone calls.
Last Mod: 24 Aralık 2008, 13:30