Recently OgNasty bitcointalk account password changed and OgNasty can not Access his Bitcoin acount ...
Before any other thing, what are you trying to find out? Are you trying to act like a monitoring spirit? To monitor his movement? Monitoring the very action of a top member of the forum like when he changes his password or takes any step in his account to report him doesn't make any sense. In my country, if you do this kind of thing without proper backing, you will be questioned seriously for not minding your business and spreading misinformation
There is a chance he happened to stumble on the fact OGNasty changed his passport by pure coincidence or chance.
It is public information, after all, anyone can have access to it. Even I have spent some idle time checking some prominent profiles on BPIP, like satoshi's and those that are most recognized around here, it is a matter of curiosity on statistics.
So in that aspect, we do not have further proof this person is actually stalking or following OGNasty's stepf on the forum.