This article contains plot spoilers for the 2017 series of Twin Peaks.
In Olympia, Washington in 1975, Duffy killed her tulpa, who said "I'm like the blue rose," before dying and disappearing. The case was investigated by FBI agents Gordon Cole and Phillip Jeffries. The tulpa's final words were used in naming the task force that Cole and Jeffries belonged to.
Duffy was indicted for the murder of her tulpa. Following this, she committed suicide by hanging.