During initial interrogations, Yoo confessed to killing 19 people. On July 18, 2004, he admitted to an additional murder: the killing of a 44-year-old male street vendor. Yoo eventually confessed to killing 26 individuals on July 19, 2004, several days after his arrest, although no details were given. The list of purported victims included several individuals that did not match his prior pattern of wealthy seniors or masseuses. Friends of two of the masseuse victims, whose bodies had been recovered, claimed they were not involved in massage therapy, meaning that Yoo could have other, unreported victims. Although the "Rainy Thursday" murderer was active contemporaneously starting in April 2004, stabbing multiple women late at night in southwest Seoul, police were unable to link Yoo to those murders.