(written from a Production point of view)
Kenneth R. Lesco (18 February 1950 – 10 October 2018; age 68) was a stuntman and stunt actor who performed stunts in several episodes of Star Trek: The Next Generation, Star Trek: Deep Space Nine, and Star Trek: Voyager. He also worked as an assistant stunt coordinator on some episodes of Deep Space Nine but received no credit for his appearances. A Starfleet command uniform worn by him was sold off on the It's A Wrap! sale and auction on eBay. 
According to the call sheet for Tuesday 8 November 1994, the fourth day of filming on the Voyager first season episode "Time and Again", Lesco was on set to double for actor Joel Polis. In the final episode however, he was "only" seen as one of the alien protestors.
Lesco was a stuntman and stunt coordinator for many popular movies, especially those directed by Quentin Tarantino. Among his credits are films such as Arizona Heat (1988, with Denise Crosby), Miracle Mile (1988, with Denise Crosby, Brian Thompson, and Jenette Goldstein), Bride of Re-Animator (1990, with Jeffrey Combs, Chuck Hicks, and Cherie Tash), Reservoir Dogs (1992, with Lawrence Tierney and Pat McGroarty), Army of Darkness (1992, with Patricia Tallman, Dennis Madalone, Tom Morga, and Brian J. Williams), Pulp Fiction (1994, with Cameron, Chris Doyle, Scott McElroy, and Dennis Madalone), Kill Bill: Vol. 1 & 2 (2003-2004, with Monica Staggs and Angela Meryl), and the stunt documentary Double Dare (2004, with Monica Staggs).
Lesco died in October 2018. (Source: Leslie Hoffman)