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How big would an asteroid have to be to wipe out all life on earth

I am in the process of writing an apocalyptic novel ending with the impact of a large asteroid and trying to make it as realistic as possible. I would like to know the minimum size the asteroid would have to be to wipe out all life on Earth as an immediate result of impact, not the atmospheric debris following the event. Any true answer will greatly assist in the realism I am trying to portray.

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The size of Texas or Alaska

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bigger than earth.

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1.5 miles around it would blow so much dirt in the air it would block out most of the sun and a new ice age would begin

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About 5 to 10 miles in size..

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waldorff

The asteroid that killed the dinosaurs left a crater about 110 miles across. Not sure how big the asteroid or meteor was (not sure what the difference is) - maybe 10 miles diameter?
Extinction wasn't immediate - probably took a few years for the food to disappear..

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