Help me throw rocks at a planet

I have a planet in a solar system that is for all intents and purposes identical to ours that I want to play like a bongo drum with asteroids or other extra terrestrial rocks to destroy most of the inhabitants, but I need the planet to be inhabitable within a short time frame afterwards (about a year). What plausible event could happen in the next 20-30 years that could cause such an apocalypse. Additionally it should be observable for at least 2 months prior to the big percussion show.

EDIT If the asteroid impacts can't leave a suitably habitable planet after 1 year, what would the minimum time be in this scenario?

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Help me throw rocks at a planet

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