Harmon was there mediating a dispute against Fusion Contact Centers attempting to resolve a dispute related to some contract work he was doing for the Center. It seems the Center was not pleased with Harmon's work and wanted him to repay most of the $30,000 Harmon was paid on a $47,000 contract. Obviously and unfortunately, Harmon had no plans on paying the money back or amicably resolving the dispute. After killing two mediation participants, he was later found dead in his apartment of an apparent suicide.
It goes without saying that these things are not supposed to happen and are not expected to happen at mediations, where the objective is to find peace amongst turmoil. This situation is just one more in a long line of reasons why we need better gun control in this country.