On Valentine’s Day 2000, 15-year-old Nicholas Ray Nick Kunselman and his 16-year-old girlfriend Stephanie Lynn Hart-Grizzell were found shot to death behind the counter of the Subway restaurant where Nick worked in Littleton, Colorado. The couple, both students at Columbine High School, were discovered in the early hours of February 14 after a coworker noticed the store’s lights still on long after closing and went inside.

The Jefferson County Sheriff’s Office investigated the double homicide and followed hundreds of leads, including several false confessions. Investigators at one point considered a connection to drug trafficking but later ruled that out. A person of interest was described as a white male about 16 to 20 years old, 5 feet 7 inches or 5 feet 8 inches tall, blondish hair, wearing a black baseball cap, blue jeans, tennis shoes and a black jacket with a red lining or a black jacket over a red shirt; he was seen leaving the back of the Subway shortly before the bodies were found.

No arrests have been announced and the case remains unsolved; rewards have been offered, at times totaling as much as $100,000. If anyone knew Nick or Stephanie or has information about the person seen leaving the back of the restaurant, please come forward.