Here is a brief report from the April 2008 issue of Bay Islands Voice, a local publication that reports news, crimes, etc. and often is critical of island authorities. It's short but the most detailed independent report I've found about the fatality.
"Unfortunately the week didn't go by without incidents. On March 19, Barbara Wojtasek, 43, an American cruise ship visitor from Norwegian Spirit died when the metal line of the zip-line ride she was on broke. Wojtasek fell around 20 meters and was transported to the hospital where she died. The incident took place at the Gumbalimba Canopy Tour in West Bay. Preliminary investigation points that neither guide nor Wojtasek were attached to a second, security cable which is a standard practice during the activity. "The guide didn't follow proper procedure," said Marco Galindo, owner of the zip-line, who added that this is the first time a cable has snapped since the operation began service in 2003.
The incident follows another death related to the zip-line tourist activity. In January an employee of another zip-line fell to his death as he slipped out of his harness and fell. On Roatan and in Honduras, zip-line is a growing but unregulated tourism industry. Currently six zip-line tours operate on Roatan."