Jonathan was the Vice-President during Yar’Adua tenure, until his death on May 5, 2010.
GEJ on his Facebook page, extolled the virtues of his former boss saying “Six years ago I lost a dear friend and partner in democracy, peace and progress. President Umaru Musa Yar'adua was a servant leader and a stickler for the rule of law. He may be gone but he is never to be forgotten. I pray for his soul and for him to rest in al Jannah firdaus.”
Yar’Adua, before becoming President in May 2007, served as the Governor of Katsina State from 29 May 1999 to 28 May 2007.
The Late President left for Saudi Arabia in 2009 to receive treatment for pericarditis.
Several controversies and rumours surrounded the state of Yar’Adua’s health, during his tenure.
The Nigerian Senate, on 9 February 2010, adopted "doctrine of necessity" to transfer Presidential powers to Goodluck Jonathan, and declared him the acting President, with all the accompanying powers, until Yar'Adua returned to full health.
Umaru Musa Yar’Adua was widely celebrated for reaching an amnesty deal with the Niger-Delta militants.