Bruce Johnson was an arson site inspector within the Baltimore Police Department who was suspected of causing some arson-for-hire crimes.
He was hired by Harper Dearing to torture and kill Carter Plimpton for classified Naval documents regarding faulty Equinox wiring on various Navy ships (codenamed Aquamarine), as well as set the Equinox storage warehouse on fire to cover their tracks. He then attended to both arson-related crime scenes.
He was eventually discovered by NCIS after deducing the remaining ingredient to perfect a particular arson-related chemical to not burn a hole through anything once planted and cornered at his home while he was leaving in his car. He offered to give any information regarding his employer in exchange for a lighter sentence.
Unfortunately, his employer anticipated the possibility that he would make a plea bargain to avoid arrest, and rigged his car to explode with him inside when he shut off the car, killing him.