"Stalking" is a loaded word characterizing intent. Following is a commonly used word that ascribes no intent one way or the other.
If you have no evidence that Zimmerman "stalked" Martin, then the correct, neutral word would be "follow".
Well, unless you aren't concerned with being neutral and objective.
Your point being?
"That there man can do a lot of funny things with this language of ours. He can take a word and weasel it around and suck the meat out of it like a weasel sucks the meat out of an egg, until it don't mean anything at all. " - Dave Sewell, quoted by Theodore RooseveltBut if you ant to use the least informative term, go ahead. Weaselling is all that separates us from the animals (except the weasel)