Yelena Tereshkova (Rus: Елена Терешко́ва) was a suspect during the murder investigations of two COSMORUS employees: maintenance technician Nick Kringle in O Deadly Night (Case #15 of World Edition) and satellite engineer Andrei Beloglazov in Horseback Mountain (Case #17 of World Edition). She would later become the killer of Russian senator Vitaly Borodin in Countdown to Murder (Case #18 of World Edition).