(written from a Production point of view)
Brett Jones is a stuntman who worked on several episodes of Star Trek: Voyager and performed stunts in Star Trek Into Darkness. A shirt worn by Jones in an episode of Voyager was sold off on the It's A Wrap! sale and auction on eBay. 
Jones worked with fellow stunt performer Patricia Tallman as stunt double for Robert Duncan McNeill on the third season episode "Future's End, Part II". He filmed his scenes on second unit on Wednesday 4 September 1996 and Thursday 5 September 1996 on location in Lancaster, coordinated by Dennis Madalone.
For the third season episode "Warlord", Jones is listed as stunt double for Robert Duncan McNeill during the prison escape scene, scene 66, on the call sheet for Tuesday 3 September 1996 along with Michael Papajohn and Dennis Madalone. However, the same scene was finally filmed on Tuesday 10 September 1996 and Jones was replaced by Christopher Doyle who ultimately was not seen in the final aired episode.