article_snippet: Worth $5million, but with the incentive to make up to $7.5m according to NFL Insider Ian Rapoport, the defensive tackle joins arguably the most fearsome front four in football.
article_snippet: The 27-year-old will likely slot in alongside either Defensive Rookie of the Year Aaron Donald or Michael Brockers to aid the St Louis Rams frightening pass rush.
article_snippet: With defensive ends Chris Long and Robert Quinn, quarterbacks facing the St Louis Rams next season - who include Matthew Stafford - will seldom get a moment's peace.
article_snippet: Following the departure of fellow defensive tackle Ndamukong Suh, the Lions have brought in Haloti Ngata and Tyrunn Walker.
highlights_snippet: The  27-year-old joins one of the most feared front fours in the NFL .
  
highlights_snippet: When fit and focused Gregg Williams' is a disruptive force in the middle .
  
highlights_snippet: But fears about injuries, attitude and off-field concerns remain .