In their push for justice, Mr Muriithi filed a case on behalf of his family before the High Court in Nakuru, seeking to have the court declare that the government failed in its duty to protect the life of his brother.
However, Mr Muriithi called on well-wishers and human rights bodies to help him prosecute the matter.
The family of slain journalist William Munuhe is keen on pursuing compensation even after the arrest of the suspected Rwanda genocide mastermind Felicien Kabuga.
Munuhe, a freelance journalist whose death was linked to Mr Kabuga, was killed in 2003.
