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The prominent clinical psychologist and mental health researcher was shot dead by gunmen on a motorbike.

The Directorate of Criminal Investigations (DCI) has launched investigations into the fatal shooting of prominent clinical psychologist and mental health researcher Dr Victoria Nthunya Mutiso, who was killed on Wednesday morning in Nairobi's Upper Hill area.

In a statement, the DCI pledged to conduct a thorough, impartial and professional investigation to establish the circumstances surrounding the killing and bring those responsible to justice.

"Detectives recovered and documented forensic exhibits for analysis, interviewed witnesses and also visited the medical facility where the victim had been taken," DCI said in a statement.