The Pakistani government has appointed a retired judge to probe the death of an officer who was investigating corruption allegations against Prime Minister Raja Pervez Ashraf.

Kamran Faisal was found dead on Friday in the government hostel where he lived in Islamabad with colleagues from anti-corruption watchdog the National Accountability Bureau.

According to the initial findings of an autopsy, he committed suicide. He was reportedly found hanging from a ceiling fan, but Faisal's family say he had marks on his wrists and dispute that he killed himself.

A retired Supreme Court judge will head the commission and submit a report in two weeks, Interior Minister Rehman Malik told reporters late Sunday. The watchdog said Faisal was a junior investigations officer working on the case against Ashraf, whose arrest was ordered by the Supreme Court last week.