Everybody has assumed until recently that all 912 Jonestown residents, including Jones, died on the same day -- Nov. 18, 1978," said Fielding McGehee, who oversees the Jonestown Institute with his wife, Rebecca Moore, whose sisters and nephew died in Jonestown.

But the tape found in Jonestown that the FBI labeled Q-875 appears to have been made many hours later, possibly on Nov. 19, McGehee said. The tape is one of 900 McGehee and Moore obtained from the FBI under a Freedom of Information Act request.

It was made later because the people on the tape -- apparently including Jones -- talked about what had happened, about the murder of Rep. Ryan and the mass deaths in Jonestown, he said.