According to Fox News, Adam Lanza, 20 years old, is the shooter. His brother Ryan, from Hoboken NJ, is being interviewed by law enforcement but he is not a suspect.
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Based on a NY Times article, Adam Lanza appears to have been an aspergery kid with above-average IQ. This seems to be a common thread in these types of incidents.
The Daily News article is more informative than the NY Times. Of note is that Adam’s father, Peter, is rich. He was paying the mom $240,000/year in alimony.
CBS quotes a neighbor, “he was very thin, very remote and was one of the Goths.”
The Washington Post quotes a neighbor: “Overall, I would just call him a socially awkward kid, I don’t know, shy and quiet. Didn’t really look you in the eye. Just kind of a weird kid, maybe. I can’t tell you any specific incidents why [I thought so].”