A six-month-old baby who was the sole survivor of a gun attack that killed six members of an Armenian family has died in hospital of his injuries.
The boy died from stab wounds on Monday, a week after the shooting in the city of Gyumri.
A Russian soldier serving at a military base is suspected of the crime and is being held at the base.
Thousands protested in Gyumri last week demanding he be handed over to the Armenian authorities.
Security has been tightened in the city, Armenia's second largest, following the boy's death.
The motive of the soldier, Valery Permyakov, is not yet clear.
Armenia is a key ally of Moscow and has agreed to become a member of Russia's new strategic bloc, the Eurasian Economic Union.
Russian President Vladimir Putin has offered his condolences to his Armenian counterpart, Serzh Sarksyan, and promised a swift investigation.