Christine Weller, 12, from Surrey, British Columbia was abducted on November 17, 1980. Her body was found more than a month later on Christmas Day, after having been strangled with a belt and stabbed repeatedly. On April 16, 1981, Colleen Marian Daignault, 13, vanished. It was five months before her body was found. Soon thereafter, Daryn Todd Johnsrude, 16, had also been abducted and killed; on May 19, 16-year-old Sandra Wolfsteiner was murdered, and 13-year-old Ada Anita Court murdered in June.

Six victims followed in quick succession in July 1981. Simon Partington, 9, was abducted, raped and strangled on the second day of the month. Judy Kozma, a 14-year old from New Westminster, was raped and strangled a week later. Her body was discovered on July 25 near Weaver Lake. The next victims were: Raymond King Jr., 15, abducted on July 23, raped and bludgeoned to death; Sigrun Arnd, an 18-year old German tourist, raped and bludgeoned the following day; Terri Lyn Carson, 15, raped and strangled; and Louise Chartrand, age 17, the last victim identified, died on July 30.

Olson was an atypical serial killer in that he targeted both boys and girls and that his victims were of various ages.