Self-confessed serial killer Geoffrey Matheri alias Fongo is admitted to a hospital in Naivasha after villagers attacked him on Sunday.
Mr Matheri was attacked in Rwanyambo village in Kinangop. His uncle, Peter Matheri confirmed the incident.
Mr Matheri was freed on Friday by the High Court in Nakuru.
Lady Justice Maureen Odero in her ruling cited lack of strong evidence to convict the accused.
He had been charged with killing Ms Miriam Wairimu on diverse dates between January 1 and August 14, 2008, at his Kihoto house in Naivasha.