Already struggling in the 2015 regular season, the Kansas City Chiefs will have to continue their year without star running back Jamaal Charles, who will miss the rest of the season after tearing his right ACL in their last game. confirmed the bad news for the Chiefs, which is just 1-4 through the first five games of the regular season.

The team initially feared a torn ACL after the 18-17 loss to the Bears Monday, and after an MRI, the season-ending injury was confirmed. The veteran running back also missed the last 14 games of the 2011 season because of a torn left ACL.

The 28-year-old Charles, who is the franchise’s all-time leader in rushing yards and led the team again this season in the running game, played in only five games last season because of various injuries.

With Charles sidelined for the rest of the year, the Chiefs will now go with Charcandrick West at the primary RB spot and Knile Davis will serve as the primary back-up. Charles finished with 48 yards on 12 carries before the knee injury against the Bears. He will finish the year with 364 rushing yards on 71 carries with 4 touchdowns.

The Chiefs are in a four-game losing streak with losses to the Denver Broncos (31-24), Green Bay Packers (38-28), Cincinnati Bengals (36-21) and Bears in the last four outings. Kansas City’s lone win came on opening day against the Houston Texans, 27-20.

Kansas City faces the Minnesota Vikings on the road before hosting Pittsburgh Steelers and Detroit Lions in their next three games.