immediately
He did it immediately.
A juzgar por la violencia del impacto, debió de morir en el acto.
Judging by the violence of the impact, he must have died instantly.
Cuéntale que te han pillado en el acto.
Tell him you were caught in the act.
They caught him in the act.
A Sami lo pillaron en el acto.
Sami was caught in the act.
Tom murió en el acto cuando la bomba que estaba tratando de desactivar explotó.
Tom died instantly when the bomb he was trying to defuse exploded.