PORTERVILLE, Calif. (AP) – A clergyman awaiting trial on charges of raping two teenage sisters plunged 400 feet to his death in Sequoia National Park, and federal authorities were investigating Tuesday whether he fell, jumped or was pushed.

The body of the Rev. Santos Teixeira was discovered Sunday after one of his parishioners reported the death, said park spokeswoman Alexandra Picavet.

Santos, 54, plunged from a 1,500-foot granite dome known as Moro Rock, landing on a ledge.

The FBI was called in to join the National Park Service investigation. An autopsy was set for Tuesday.

As for whether Teixeira was pushed, fell or jumped, “we have no idea,” Picavet said. “That’s the investigation.”

Authorities were questioning Teixeira’s friends and family members, including a 25-year-old parishioner who was with him at the time of his fall. Picavet would not identify the man or say whether he was a suspect.

Authorities asked anyone who was at Moro Rock on Sunday afternoon to call park rangers. The spot is popular park destination and offers a view of some of the high peaks of the Sierra Nevada.

Teixeira was the pastor of Iglesia Del Nazareno, a Protestant church in Porterville. He was scheduled for trial in December on charges of raping two sisters who attended his church.

Prosecutors said Teixeira befriended the girls and their mother shortly after the family moved to the area from Mexico.

Teixeira’s lawyer, Debra S. White, has said that there was no physical evidence of a crime and that the girls’ statements were vague and inconsistent. White did not immediately return calls Tuesday.

Teixeira could have gotten 45 years to life in prison if convicted.