I tend to believe Mpamaegbu's story about forgetting to cite the source, simply because I'm familiar with him as a member and I know damn well that he knows how seriously plagiarism is taken on the forum, and I seriously doubt he'd take a chance that someone wouldn't discover the source of that post. I've chatted with him via PMs, and he's always been trying to do the right thing as far as I can tell.
Well he's been
banned 
Quite sad to lose a Hero member account under such circumstances. Damn ! It's hard to get a hero member rank from 0 merits, if you ask me. The pain must be unbearable.
I am not sure if he will try to appeal, but man, this is a shocker. I don't know why he didn't bother adding the link to the said post, even after the discovery that he mistakenly missed it. I mean, it was a mistake to forget the link, right? Why not added it if you realized the mistake?