Hartanto Teguh Santoso, 31, was last seen at his Kirkland, Washington, apartment on the evening of February 19, 2001. Neighbors at the Four Cedars Apartments reported hearing shattered glass, loud banging, thumping and multiple screams around 10:45 p.m., and a car speeding away about 11:00 p.m. Santoso’s front door was found ajar, a cinder block had been thrown through a window, and blood was present inside and outside the residence.

The next day Santoso’s car was discovered in the Seattle–Tacoma International Airport parking garage with a parking receipt time-stamped 11:51 p.m. A significant amount of his blood was inside the vehicle. Flight records showed no indication he boarded a plane and his passport was not used after his disappearance. Forensic investigators concluded the volume of blood made survival unlikely, and Santoso was legally declared deceased in June 2002.

The investigation focused on a former friend, Kim Heichel Mason, who was convicted in July 2003 of aggravated first-degree murder and sentenced to life without parole. Mason has refused to disclose the location of Santoso’s remains, leaving the family without a burial. If anyone has information about where Hartanto Santoso’s remains might be, please come forward.