A former senior Free State municipal official was found guilty of murdering Naledi mayor Motlantsi “Joko Motloi” by the Bloemfontein High Court on Thursday.
Free State Judge President H M Musi found Caroline Mokgothu and her paramedic husband James Mokgothu guilty on the main count of murder.
They also faced an alternative charge of conspiracy to commit a crime.
Assassin Senowe Khaka, 28, from Lesotho, admitted to the murder and was sentenced to 21 years' imprisonment during a separate trial.
At the time of Motloi's murder in May 2010, the municipality had been plagued by infighting between councillors, municipal officials and workers since 2006.