Keith Grimmett is charged with murder. Charges against him were upgraded after manager Robert Kuentz died.
Prosecutors say the two men were discussing Grimmett's sale numbers at the Mac Haik used car lot in west Houston in November.
The next day, Grimmett allegedly returned with a gun and shot Kuentz.
He died a few days later.
Take ABC13 with you!
Download our free apps for iPhone, iPad, Android and Blackberry devices