This is how it happened. This is how your MLB team died in 2015.

As September rolls on into October, teams are being systematically eliminated from the MLB postseason. Here is a look at what caused the demise of each team as they are mathematically eliminated from playoff contention:

• Philadelphia Phillies: Undergoing major rebuild, never really had a chance. Time of death: September 9, 2015

• Atlanta Braves: New regime gutted team, trading away several key players. Time of death: September 10, 2015

• Cincinnati Reds: Aging team made several moves at the deadline, trading away veterans. Time of death: September 11, 2015

• Colorado Rockies: Gave up the ghost with the Troy Tulowitzki trade. Time of death: September 12, 2015

• Miami Marlins: Key injuries and a managerial change were too much to overcome. Time of death: September 13, 2015

• Milwaukee Brewers: Made wholesale changes, replacing both their manager and general manager. Time of death: September 13, 2015

• San Diego Padres: First-year general manager A.J. Preller went all in and busted. Time of death: September 18, 2015

• Oakland Athletics: Billy Beane unable to work his magic with roster turnover. Time of death: September 18, 2015

• Arizona Diamondbacks: Paul Goldschmidt had another excellent season, but did not have enough help. Time of death: September 20, 2015
  
  
• Detroit Tigers: A deadline sell-off led to a general manager change, and ultimately failure in 2015. Time of death: September 26, 2015
  
  
• Chicago White Sox: A woeful offense was not enough to support a pair of big-name pitchers at the top of the rotation. Time of death: September 26, 2015
  
  
• Seattle Mariners: Nelson Cruz worked out, but Felix Hernandez and the pitching staff did not. Time of death: September 27, 2015