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Matt was a terran who lived in "the Gutter." He worked for the crime lord Fagin by selling hab in Pyke Lane, alongside Jewel. The two developed romantic feelings for each other and while they were not open about it, their feelings were "hardly a secret".
It was a secret that made its way to Fagin, executing Jewel as punishment for "spending time thinking 'bout flickin' and not enough time thinking 'bout workin'." Matt thus returned to work, scared and grieved, but secretly glad that it was Jewel who was shot and not him.