Before he can reveal his secret, he is shot by an unknown assassin.

While trying to save Kevin from unknown assassin, he disappears.

I do not wish to die by an unknown assassin's bullet.

Before he could inform any more, he is then killed by an unknown assassin.

In November 1949 he was killed by an unknown assassin.

No one will be too surprised when unknown assassins gun him down from ambush.

Batman must protect a family from an unknown assassin during the holidays.

He felt a chill when realized how close the unknown assassin came to killing both the Dragon and himself.

The ambulance is driven by the reporter's father and he was the unknown assassin.

They were shot dead by unknown assassins dressed in military uniform.