LOS ANGELES — Chris Cahill, one of the original Dogtown Z-Boys who brought seismic changes to skateboarding with their style and attitude, has died. He was 54.

Cahill was found June 24 at his Los Angeles home, said Larry Dietz of the Los Angeles County coroner’s office. A cause of death has not been determined and tests are ongoing, Dietz said.

The Z-Boys came together in the 1970s at the Zephyr surf shop in Santa Monica. Dogtown referred to a coastal area of south Santa Monica and Venice.

“Skateboarding was always kind of about surfing,” said Keith Hamm, who wrote “Scarred for Life,” which he called a cultural history of skateboarding. “The Zephyr team skated like they surfed,” Hamm said, so as surfboards got shorter and more maneuverable the Z-Boys brought a “sharp-turning, faster, aggressive style” to skateboarding.

The Z-Boys were the subject of the 2001 documentary “Dogtown and Z-Boys” and their story was fictionalized in the 2005 film “Lords of Dogtown.” The documentary, co-written and directed by Z-Boy Stacy Peralta, only briefly mentions Cahill.

Cahill was an accomplished kneeboarder and “at one point was the best in the world,” said Nathan Pratt, another original Z-Boy.

Cahill told Juice that his “competitive nature wasn’t that strong in skating.” He later worked for Pratt at Horizons West surf shop in Santa Monica before starting his own store. Cahill also lived in Hawaii, Brazil and Mexico and “was an accomplished fine artist,” Pratt said.