Caio César, who provided the voice of the boy wizard in Portuguese territories around the world, was also a police officer in Rio de Janeiro.
He tragically was killed on duty earlier this week, WENN.com have reported.
JK Rowling, the author of the world famous Harry Potter series, took to Twitter yesterday evening to share the sad news with Potter fans.
She wrote: "Desperately sad to hear that Caio César, Brazilian voice of Harry Potter, has died at the age of 27. “My thoughts are with his family."
Reports suggest Cesar was shot in the neck during an investigation and taken to a nearby hospital, where he underwent emergency surgery.
He died hours later.
Charles Emmanuel, the actor who dubbed Rupert Grint's voice as Ron Weasley in the Portuguese version of the Harry Potter series, also took to Twitter to honour his late friend.
He wrote: "Everyone has heard the voice of Caio Cesar at some point. I've had the opportunity to work with him several times, because we are the same 'generation' of voice actors...
“He was a runt, skinny, and needed a stool... only he grew up, was pumped (and) went (on) to become a policeman."
Cesar also added his voice to the Portuguese versions of Avatar: The Last Airbender, X-Men: Evolution and How to Train Your Dragon.
Our thoughts are with his family and friends at this sad time.