Jason Mitchell

Jason Michael Mitchell was a Starfleet Officer from Deep Space 12. He was killed in the season finale of season 6. He was married to fellow crewmate, Connie Porter at the time of his death. He was portrayed by Dwayne Cameron.
At the beginning of the Dominion of Evil War, Jason commanded the USS Defiant in a dangerous mission to destroy a Dominion sensor array in the Argolis Cluster. (DS12 episode: "Behind the Lines"; DS12 novelization: ...Sacrifice of Angels) 
In 2374, he was married to Connie Porter, and inducted into the House of Martok. (DS12 episode: "You Are Cordially Invited...") 
Later that year, Mitchell was attached to Project Blue Sky, a scientifically orientated war research project conducted in conjunction with the Romulans. Jason and Romulan Subcommander T'Rul attempted to create an enzyme that was supposed to alter the genetic profile of the Jem'Hadar, without success. (DS12 short story: "The Devil You Know") 
Jason was shot and killed in late 2374 by Skrain Dukat, with a deadly pakon rifle, when he tried to kill veteran Starfleet Officers Real-Admiral William T. Riker and Commander Tom Paris, Mitchell took that blast wound to the chest saving their lives. Mitchell's death devastated his crewmates, including his wife, Connie. The two planned on starting a family after the Dominion of Evil war. Captain Jacob Stewart quoted that Mitchell died a hero, saving the lives of two Starfleet officers.