The rock will most likely be "dead" now, but if you put it into a tank with other "live" rock, it will become "live" again over time. If your buddy is giving it to you, I'd take it and supplement it with other "live" rock, and you should be good. Make sure you wash it out thoroughly before putting it into your system, or all the dead critters in the rock will add a lot of unwanted nitrites/nitrates/ammonia into your system.
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