A $10,000 reward is being offered for tips that can lead local authorities to a killer.
Rolando Castillo was murdered inside his home on June 27.
Detectives say they still don't have any witnesses so far.
Crime Stoppers is offering a $5,000 reward for information that leads to an arrest in the investigation. Castillo's friends will pay another $5,000.
If you have information on this case, you are asked to contact Crime Stoppers at 210-224-STOP. You can also provide tips online or by texting, using the keyword: SATIP and your message to 847411 (Tip411).