A reward of $100,000 is offered by Colorado officials for information leading to the suspect(s) in relation to the Valentine’s Day double murder of a teenage couple decades ago. Metro Denver Crime Stoppers announced the major reward increase in a statement 21 years after “high school sweethearts” Nicholas Kunselman and Stephanie Hart-Grizzell were found shot dead on Feb. 14, 2000, inside a Subway sandwich shop in Littleton, Colorado, leaving the community shocked. “With this significantly increased reward, people who haven’t come forward with their information will be much more likely to do so now,” Jefferson County Sheriff Jeff Shrader said. Jefferson County detectives have been working on the cold-case continuously since the day it happened and believe someone has kept crucial information on the case. With the reward increased, authorities hope to find a tip leading to an arrest and bring justice to Kunselman and Hart-Grizzell. Shrader said investigators are “continuing …