Jack Crusher (mirror)

In the Mirror Universe, Jack Crusher was a longterm friend of Jean-Luc Picard and a fellow officer in Starfleet.

Jack married Beverly Howard in 2348 (TOS novel Spectre) but within a matter of months, was being asked by Picard about the likelihood that he'd share Beverly between himself and Picard. Picard halted these queries when Wesley Crusher was born (TNG novel Dark Mirror), but continued a few months later. Eventually, a fight ensued between the two men and Jack was murdered (TOS novel Spectre).