( CNN ) -- The retrial of Egypt 's former president , Hosni Mubarak , on charges of killing protesters during the country 's 2011 revolution and profiteering resumed Saturday before being adjourned until next month . Mubarak was forced from office in February 2011 following two weeks of mass street protests . Following a lengthy trial , he and his former interior minister , Habib al-Adly , were found guilty and sentenced to life in prison last year on charges that they were complicit in the protesters ' killings . After appealing their convictions , they were granted a new trial early this year . Six of Mubarak 's former security aides last year were acquitted of charges related to the killings , and Mubarak 's two sons -- Gamal and Alaa -- were acquitted of corruption charges . But they , too , were ordered to be retried after President Mohamed Morsy , himself ousted this week , ordered a new investigation last year . Mubarak and the other defendants have pleaded not guilty to all charges . Mubarak was present in court Saturday for the fourth session of the retrial , wearing his signature sunglasses . He made his first court appearance in May . The retrial has been adjourned until August 17 , the prosecution said in a statement . A public prosecutor sent Mubarak -- who spent months detained in a military hospital -- back to prison in April . Mubarak 's health has been a bone of contention during his trial and incarceration . He suffered a heart attack after relinquishing power and had maintained that he was physically unfit to stand trial . Mubarak has been held since his guilty verdict last year . He is also charged with seizing public funds and misusing political influence . He also faces a corruption charge that was not part of the original trial . Mubarak is accused of selling natural gas to neighboring Israel for prices below fair market value . The ousted autocratic leader spent three decades in charge of Egypt , the most populous Arab country . Journalist Adam Makary contributed to this report .
NEW : The retrial of former President Hosni Mubarak is adjourned until mid-August . Comment: Mubarak was forced from office in February 2011 following two weeks of mass street protests . Mubarak was convicted last year but was granted a retrial after appealing his conviction .