Wayne Williams's

http://en.wikipedia.org/wiki/Wayne_Williams
Wayne Williams's trial began on January 6, 1982. The prosecution's case relied on an abundance of circumstantial evidence. During the two-month trial, prosecutors matched 19 different sources of fibers from Williams's home and car environment: his bedspread, bathroom, gloves, clothes, carpets, his dog, and an unusual tri-lobal carpet fiber to a number of victims. There was also eyewitness testimony placing Williams with different victims, blood stains from victims matching blood in Williams's car, and testimony that he was a pedophile attracted to young black boys. Williams himself took the stand, but he seemingly alienated the jury by becoming angry and combative. Williams never recovered from that outburst, and on February 27, the jury deliberated for 12 hours before finding him guilty of murdering Cater and Payne. Williams was then sentenced by the Court to two consecutive terms of life imprisonment.[1]

Criminalistics, Saferstein 9th Ed.
http://wps.prenhall.com/chet_saferstein_criminalistics_9/

Important part to know is how probable it is to find the same fibre in a different place and what's the significance of this evidence?

it is the duty of the examiner as an impartial witness, to explain the evidence in terms of significance so that it will be clearly understood.