Constable Klinzy Masinde Barasa, the police officer accused of fatally shooting 22-year-old mask vendor Boniface Kariuki Mwangi, appeared before the Milimani High Court on Thursday to face murder charges.

At the same time, the DPP dropped charges against his colleague, Duncan Kiprono, for lack of evidence linking him to the murder of Kariuki.

The prosecution has not made it clear whether Kiprono will be treated as a witness in the case against Masinde.

Masinde, however, did not plead to the charges after Justice Kanyi Kimondo ordered a mental assessment to determine his fitness to stand trial. "You will be removed from police custody and you will be remanded at Nairobi Remand.