He is a fast/slow 'walker'. [=he walks at a fast/slow pace]
She joined a group of 'walkers' in the neighborhood.
(..) is in very good hands. Mine. Agent patel. She will be your liaison in the investigation. Walker brought me up to speed. What's our next step? I take it you worked alongside agent roberts? Yes, he joined the advance team about three years ago. (..)2016 TvShow: Bones Title: The Secret in the Service Season: 11 Episode 17
(..) The people that protect the president? Looks like one of their own was just murdered. Booth, this is agent brandt walker with the secret service. Seeley booth, i've heard a lot about you. It's an honor to meet you. Only active agent to ever take a bullet for the president. (..)2016 TvShow: Bones Title: The Secret in the Service Season: 11 Episode 17