Garcia was best known for voicing the "Jimmy Neutron" character Sheen Estevez in the movie and Nickelodeon television series.

Jeff Garcia, an L.A. comedian best known for voicing Sheen Estevez on Nickelodeon's 'Jimmy Neutron,' has died at 50.

This happens to be the same day that the iconic voice behind Sheen Estevez on Jimmy Neutron, Jeff Garcia, passed away at 50 years old. Jeffrey had been hospitalized for a case of pneumonia. He was taken off of life support on the night of December 9 and passed away the following morning on December 10.