The idea is the victim keeps finding little scraps of paper with a short sentence written on them. The first few sentence indicates whoever wrote it had a clear understanding of what the person was thinking as they picked the note up. Something like 'you don't know why, but you think something might be following you' or along those lines, that the person was thinking just as he picked the note up (probably not that line, but hey). The following sentences will then seem to show events in the future, such as the note reading 'your daughters funeral was lovely' when the daughter is still alive, then later that day she dies, or 'it's a shame about the car' and later that day he is involved in an accident. This goes on for a few days or weeks.
The final note is one that has no writing but a drawing of a place. This place isn't familiar to the person, but victims family have recognised it as the place to which the victim was going when he was last seen. Because after that last note the victim will disappear, presumably at that place.
The scraps are found sometimes in a conspicuous place on the floor, on a notice board, in a book or newspaper or in a pocket. Somewhere the person will easily find it.
I was gonna have the previous notes dematerialise, or powder into a kind of ash before the next note was found, and have the scrap of paper be the same shape each time too.
Either way, that's the basic idea behind it.