Derrick Williams was found guilty of capital murder in the robbery and beating death of Mohamed Alnazali in Meridian.
The businessman was found dead in August 2008 at the Bonita BP Station he owned.
"Stand up, Mississippi. We're still burning!" shouted Williams, 26, to family or friends, as he was led to the Lauderdale County Jail across the street from the courthouse.
The jury deliberated just over two hours. In addition to capital murder, Williams was also convicted of armed robbery and auto theft.
Williams was sentenced to life in prison for the murder. Prosecutors did not seek the death penalty. An additional 30 years was imposed for the lesser charged.
Williams' attorney, Kenya Martin, said immediately after the trial that she's uncertain about whether an appeal will be filed.
The first to take the stand Tuesday was Williams' former girlfriend, 22-year-old Izola McMillan. She testified that she and Williams needed money to get back to Chicago. In all, she says they got away with $1,100.
District Attorney Bilbo Mitchell says McMillan was a key component in the outcome.
"We had some problems because we had one witness we couldn't find and we had one witness that died since the murder," said Mitchell. "So, that's why we ended up having to call the co-defendant to testify."
McMillan faces a possible 40 years behind bars.