Mr. TOM OWEN (President and CEO, Owl Investigations, Inc.): He speaks in a very structured manner, and he speaks that way all the time.

NPR: Bin Laden Tape Won't Raise Security Levels

Audio experts Tom Owen and Ed Primeau, who analyzed the 911 recordings for the Orlando Sentinel, said they don't believe it is Zimmerman who is heard yelling in the background of one 911 call.

CNN: STORY HIGHLIGHTS

Thornton remained on the show until it ended in 2010, working alongside new characters played by Owen's son Tom, Keith Clifford and Brian Murphy.

BBC: Are You Being Served? actor Frank Thornton dies aged 92