The Lions signed Williams to a contract Saturday, Aaron Wilson of KPRC 2 Houston reports.
With Jacob Saylors (ankle) and Kye Robichaux (foot) both suffering lower leg injuries, the running back depth for the Lions has taken a significant hit since Thursday. Williams was likely signed to bolster the preseason corps as they look towards next Saturday's game against the Commanders. The 28-year-old played in three regular-season games for the Chargers last year, playing 56 total snaps and rushing three times for a loss of one yard.