Kingara was the founder and director of the Oscar Foundation Free Legal Aid Clinic, a human rights organization based in Nairobi.

After graduating and acquiring a law degree, he opted to venture into the family business that involved manufacturing industries, meat and fish processing, real estate, import/export and dealership of building materials in Kenya.

[5] In 2008, he released a report accusing Kenyan police of killing or torturing more than 8,000 people as part of a crackdown on the Mungiki criminal organization.

On March 5, 2009, Kingara and his assistant, John Paul Oulu, were ambushed and shot as they sat in rush hour traffic in a white Mercedes outside of the University of Nairobi dormitories.

[1] Following the assassination, WikiLeaks called for witness reports and described Kingara and Oulu as "Wikileaks-related senior human rights activists".