I'm sorry - but your prejudice is showing.
As I understand it, he was a foreign student, legitimately in the US on a student visa.
Just WHERE does it say he was an 'illegal alien'?
If you ever want to lose that barrel, you'll have to get some intellectual honesty yourself.
The article calls him a "Nigerian native" meaning he is
grounded in, lives in, and is a citizen of .... Nigeria.
Here's some intellecual honesty. Every Nigerian I've met in the US has been a liar and a thief. And the one in this article is a mass murderer.
Actually you're both wrong, he was a naturalized citizen since the late eighties.
Which means he could have been a beneficiary of Reagan's amnesty, but there's no way to know at this point...