Unfortunately, her first day of work which also happened to be her last ended in tragedy as while studying the body of a man who had fallen from an empty high-rise building, an unknown sniper/gunman began firing random shots, many of which hit the crime scene and caused everyone to run for cover.
Shannon wasn't lucky as she got shot through the head and died immediately, her body resting in the crime scene.
Once the gunfire had stopped, Horatio listened for a heartbeat, repeating the same pattern he had done when Tim Speedle had been shot but found nothing. Eric had quickly her pulse while under fire and had mentioned that she was gone.
It is not known what became of Higgins's remains but it is presumed that she was given to her family for a proper funeral and burial.
The case was eventually solved and Higgins's murderer was brought to justice.
Higgins was replaced by Tara Price.
Shannon Higgins was played by Allison McAtee.