Mr. Calvache had at least one gunshot wound and was pronounced dead at the scene. A single handgun was found at the site, police said.
Hillsborough police received a 911 call reporting the shooting just after 6 p.m. on June 15.
Bradley Kleiman, 30, was taken into custody following the incident. Mr. Calvache was visiting Mr. Kleiman, a longtime friend, at home when the shooting occurred, police said.
Mr. Calvache grew up in Woodside but was living in San Francisco, police said. He had a Woodside post office box number, according to the San Mateo County Coroner's Office.