Family and friends are mourning the death of Kurt von Tillow, a Sacramento-area man who was confirmed as one of the victims of Sunday’s mass shooting in Las Vegas.

El Molino High School in Sonoma County, where von Tillow graduated in the class of 1980, confirmed his death in a post on its Facebook page. Von Tillow, a Cameron Park (El Dorado County) resident, was in Las Vegas for a family reunion when a gunman opened fire on the Route 91 Harvest country music festival, killing 58 people and injuring more than 500 others.

The school said that von Tillow’s sister and niece were hospitalized with injuries from the shooting and both are expected to survive. His wife, daughter and son-in-law also were at the concert but escaped uninjured.

Mark Carson, von Tillow’s brother-in-law, described him as a patriotic person who loved his family.

“Guarantee you, he was covered in red, white and blue, with a Coors Light in his hand, smiling with his family and listening to some music,” Carson said in an interview with KCRA.

Family and friends held a memorial at Cameron Park Country Club, where von Tillow was a member, Monday night.

“He loved to golf, loved his club, loved his family, loved his country,” Carson told KCRA. “He’ll be really missed.”

Annie Ma is a San Francisco Chronicle staff writer. Email: Twitter: @anniema15