Tulak Hord's lightsaber was first mentioned in the "Legacy of Tulak Hord" Codex entry in Star Wars: The Old Republic, a video game released by BioWare and LucasArts in 2011. Darth Marr appears with a lightsaber in the game itself, though it is not known whether Marr kept Hord's lightsaber for his own personal use.
The lightsaber is available for purchase in the game's "Cartel Market." As such, it can be assumed that Marr did not carry Hord's lightsaber, as Marr's saber model differs greatly to that of Tulak Hord's.