A Maputo-based businessman, he had been linked to two high-profile murders in Mozambique, both of which are widely reported to have occurred because of their victims' anti-corruption activities.
On 9 September 2006 the Mozambican News Agency (AIM) reported that the weekly Maputo newspaper Savana had published the 1998 contract between the privatised Austral Bank and Nyimpine Chissano, under which Chissano was to be paid US$3,000 a month for consultancy work.
In the 2002 Cardoso trial, Nyimpine Chissano denied any contacts with Austral Bank.
On 11 August 2001, Siba-Siba was murdered at Austral's Maputo headquarters; his killers have never been positively identified, but press reports in Mozambique have identified a former member of Joaquim Chissano's Presidential Guard as the murderer.
On 11 May 2006, AIM reported that the Mozambican public prosecutor's office had charged Nyimpine Chissano of "joint moral authorship" of the murder of Carlos Cardoso.