Adenhart, 22, died after undergoing surgery, University of California, Irvine Medical Center spokesman John Murray said.
A fourth person remained hospitalized in critical condition.
The Angels confirmed Adenhart's death in a statement and said no other members of the Angels organization were involved in the accident.
"The Angels family has suffered a tremendous loss today. We are deeply saddened and shocked by this tragic loss. Our thoughts and prayers go out to Nick's family, friends' loved ones and fans," general manager Tony Reagins said.
The team said Adenhart was survived by his parents, Jim and Janet.
"He lived his dream and was blessed to be part of an organization comprised of such warm, caring, and compassionate people," the family said in a statement issued through the team.
"The Angels were his extended family. Thanks to all of Nick's loyal supporters and fans throughout his career. He will always be in everyone's hearts forever."

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