John Altobelli died Sunday morning, according to college officials. Altobelli was the longest-tenured baseball coach in the school's history and was entering his 28th season, according to the OCC Pirate Athletics.
Christina Mauser, an assistant basketball coach at Harbor Day School in Orange County, was also killed in the crash, according to friends and family.
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According to Altobelli's brother, Tony, he was on the aircraft with his wife and daughter Alyssa when it crashed shortly before 10 a.m. in rough terrain in the area of Las Virgenes Road and Willow Glen Street.
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Paramedics also helicoptered to the scene and were hoisted down to try to aid any possible survivors, but all died at the scene, officials said.
Altobelli led the Pirates to numerous championship titles, garnering more than 700 wins during his career and four state championships.
"John meant so much to not only Orange Coast College, but to baseball," said Coast Athletic Director Jason Kehler in a written statement. "He truly personified what it means to be a baseball coach. The passion that he put into the game, but more importantly his athletes, was second to none - he treated them like family."
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Community members began to gather and mourn at the college Sunday following the news of his death.
Christina Mauser's husband Matthew Mauser, the head basketball coach at the school, posted on Facebook: "My kids and I are devastated. We lost our beautiful wife and mom today in a helicopter crash. Please respect our privacy. Thank you for all the well wishes they mean so much."
The school put out a brief statement saying the campus is in mourning: "Harbor Day School is devastated by the news. We are mourning the loss of members of our community. Our first priority is the well-being of our students. As news is publicized, we will ensure that our support team is made available to assist and counsel our students. We appreciate your patience and understanding."