Come on, people. There's really nothing to get offended about in this chapter. Some anonymous assholes revealed his real name and address over the net in the previous chapter, that's how he got to find our guy. Or he could be stalking the girl again and followed her to his house. It's not that hard to put two and two together.
Although, I think we can chalk it up to the artist's inexperience if you find the stalker's reappearance too sudden and jarring.