Elisabeth Kubler-Ross's five stages of grief are a pioneer model, but not everyone experiences all stages or in a linear sequence.

“And I should emphasize that while Kubler-Ross was a real pioneer in establishing that there are indeed different stages of grief, the modern science, both psychology and neuroscience, point to the fact that not everybody experiences all of the stages that Kubler-Ross defined, nor do they move through those stages in a linear manner.”