Chief Inspector Monica Wambui Githaiga, the lead investigator during the Dusit D2 terrorist attack is dead.

The senior police officer collapsed and died at Jomo Kenyatta International Airport (JKIA) shortly after jetting back into the country.

The Standard reports that Wambui had complained of feeling unwell disclosing that she had chest pains and was feeling dizzy while in Dubai and had been treated and allowed to board the flight back home.

She was pronounced dead upon arrival at a clinic located within the airport.

The deceased had been away in Japan where she was taking a short course.

Wambui was attached to the Anti-Terror Police Unit (ATPU) and was the lead investigator of the January 15, Dusit D2 terror attack that claimed 21 lives.

It was not immediately clear what caused her death with an autopsy set to establish what caused her death.