The two have been asked to furnish a bail amount of Rs five lakh each and have been barred from travelling outside Kerala.
The Special Court judge K Sanilkumar heard the convicts before reading out their sentences. The verdict has come as a near surprise as crucial prosecution witnesses, at least nine of them, had turned hostile during the trial stage.
Dr C Radhakrishnan who had conducted the post-mortem examination on Sister Abhaya's body said that it was possible the nun could have been thrown into the well of St Pius Convent, Kottayam, after she was hit on the head.
The nearly five-hour cross-examination in the CBI Special Court on Wednesday of CBI superintendent of police Nandakumaran Nair, who probed Sister Abhaya's death late 2008, was a meticulous, time-consuming exercise devised to drill large gaping holes in every aspect of the investigation under him.