The parents of Uber CEO Travis Kalanick were in a boating accident Friday evening at Pine Flat Lake in Fresno County, injuring Kalanick's father, and tragically killing his mother. As NBC Bay Area reports, the couple's boat hit a rock and sank, and officers with the Fresno County Sheriff's Office found them on a shore of the lake.

Bonnie Kalanick, 71, died at the scene, and Donald Kalanick, 78, reportedly suffered moderate injuries.

Uber's chief human resources officer Liane Hornsey sent an email to Uber staff calling the incident an "unthinkable tragedy, and saying "everyone in the Uber family knows how incredibly close Travis is to his parents."

Recode's Kara Swisher writes about meeting Kalanick's parents at their Los Angeles home, calling them both "gracious hosts." She says that Bonnie Kalanick "was also deeply proud of her son — she kept pulling out clips she had torn out of newspapers and magazines about him and showing them to me as only a loving mother would."

Kalanick, 40, grew up in the Northridge neighborhood of LA and founded Uber in 2009.