*Whose* high school yearbook was it? I'm not caught up on all of the JMK junk in the media today, but some.
It was a classmate's. He had this fancy scroll type writing, but there were very similar letters the a's, t's--especially the d's. He did his d's in one stroke, ending with the tip of the d, just like the ransom note. I am not an expert, but apparently one out there is already saying, if these handwriting samples (there is also a job application he puportedly completed) then they may have the murderer.
Just one more interesting tidbit to chew on.