Harish Patel was charged with first-degree murder in the death of his estranged wife Vanlata Patel.
The verdict came after more than two weeks of evidence -- all from prosecutors.
Jurors deliberated Wednesday through Friday.
In his closing argument, the prosecutor used a red plastic gas can as a prop. The can was a centerpiece of the state's case.
The jury saw surveillance video of Harish Patel buying it and gas at a convenience store near his apartment in Cary on January 16, 2008.
Hours later, his wife's body was found burning off I-85 in Mecklenburg County, Virginia.
Vanlata Patel's son reported her missing to the Cary Police Department on January 17, after she failed to board a flight to visit him in Canada.
Patel will be sentenced to life without the possibility of parole.