Humphries is certainly not a new name around these parts. We profiled him back in March, and I actually selected him for the Lions in SB Nation's 2015 NFL writers mock draft. He is a potential first-round pick, and he could very well be the Lions' starting left tackle next season if he ends up in Detroit.
Murphy is merely the latest return specialist to visit the Lions. They have previously hosted J.J. Nelson, Kaelin Clay and Tyler Lockett. The main difference here is that those three players are all receivers, whereas Murphy is a running back. At Missouri, he rushed for 1,957 yards and 16 touchdowns and averaged 5.8 yards per carry over the course of four seasons. And as a returner, Murphy took three kicks and four punts back for touchdowns during his career.
Murphy is projected to go undrafted by CBS Sports, so he could be a potential late-round pick or UDFA signing. Either way, it's clear that the Lions want to bring somebody in to upgrade their return game, and Murphy is yet another possibility in that regard.