On Saturday, his brother Marcos paid homage to Diego by throwing out the ceremonial first pitch at the Oakland Athletics game.
Marcos says Diego was the ultimate A's fan.
"Kept up with the team, kept up with the stats, trading, all that stuff, always kept me informed," Marcos said. "He was my app, my A's app."
Diego was such an avid A's fan that his family buried him wearing an Athletics jersey.
The Garcia family used a big social media campaign called "First Pitch for Diego" to set up Saturday's event.
They hope their efforts will lead to more awareness of the problem of drunk driving.
"First Pitch for Diego" social networking information: