Mbili died in a single-vehicle car accident on 10 July 2012 on the N2 near Lamontville in KwaZulu-Natal. He had allegedly lost control of his 4x4 and landed in a ditch while he was en route to his home in uMgababa from the airport. He had recently been discharged from hospital and was recovering from an earlier car accident. His funeral was held on 22 July 2012 at the Esibaneni Sports Ground in Mtwalume. On 7 August 2012, the National Assembly passed a motion of condolence to his family.