San Diego architect Graham T. Downes died on April 21 from injuries following a late-night fight two days before with an employee outside his San Diego home. He was 55. Downes suffered blunt force head and neck trauma, including numerous skull fractures, from the altercation with Higinio Soriano Salgado, according to the San Diego County coroner’s report.

Police found Downes unconscious in the street in front of his home. Salgado, 31, pleaded not guilty to murder charges on April 23; he remains in custody on $3-million bail. A preliminary hearing is set for May 11.

Spokepersons for the police and for the district attorney did not make public a motive for the assault.

South Africa-born Downes launched his eponymous architecture and planning practice in 1994. His 40-person firm focused on boutique hotels, restaurants, retail, and multi-unit housing in Southern California, Nevada, and Arizona.

The private firm’s best-known work includes the 12-story, 420-room Hard Rock Hotel and 45,000-square-ft Tower 23, both in San Diego. Downes started the unbrella firm Blokhaus in 2011.

Graham Downes Architecture was among the 250 top-earning design firms in the U.S. ranked by Architectural Record in 2008 and 2009.

The company will continue without its founder, officials say.

“Graham was a brilliant designer, creative visionary and vivacious, strong and kind leader. We are actively working to continue his vision through the work of Graham Downes Architecture,” said Blokhaus CFO Alix Veen in a statement.