After a decade of detailed investigative research into the D.B. Cooper case, businessman and self-described “Cooper buff” Eric Ulis released a 127-page report titled “D.B. Cooper: The Definitive Investigation of Sheridan Peterson” that asserts that the 92-year-old former Boeing employee was the notorious hijacker. Ullis reviewed thousands of pages of documents, including FBI documents released under the Freedom of Information Act. The investigation also included interviews with FBI agents who worked on the case, principal figures involved with the case, experts who studied the case and scientists who analyzed critical pieces of evidence. These interviews also include phone, text and email communication with Peterson himself. The report is available at thecoopercase.com.