The plane crashed near Box Elder Peak in American Fork Canyon, said the Utah County Sheriff’s Office in a press release.
The crash was seen by a man on a hike with his two sons, who called 911, the statement said.
“The witness said that the plane spiraled out of sight and moments later he heard the impact,” the statement said.
The Sheriff’s Office search and rescue team, a Utah Department of Public Safety helicopter and Lone Peak Fire and Ambulance were called to the scene. The four victims died under impact, the statement said.
In a statement, the Philadelphia Phillies said, “The Phillies organization extends its sincere condolences to the family and friends of former pitcher Tyson Brummett, as well as three members of the Ruegner and Blackhurst families, who died tragically in a plane crash yesterday morning. ”
The NTSB and the FAA are investigating the cause of the accident.