The news was revealed by Governor Susan Kihika during an interview with a vernacular station.
The accident took place on Thursday night.
The MP was gunned down on Ngong Road, near the City Mortuary roundabout.
After announcing his intention to vie for the Presidency, the MP is on a tour to mobilise youths.
The MP clarified the remarks he made in Parliament on the BBC Documentary.
Otula also had stints at Mang'u High School and recently at Sunshine Secondary School.
Orengo made the controversial sentiments during the groundbreaking ceremony of the Boro Maternity in Central Alego.
The CS made the remarks during the Labour Day celebrations at Uhuru Gardens.
The incident comes barely two months after President Ruto's motorcade ran over a foreigner.
This comes as Kenyans grapple with unemployment.