Jones decided enough was enough Monday, following a 45-7 loss to the Green Bay Packers the night before. It was the Cowboys' fifth straight loss, dropping them to 1-7.
This is their worst season since 1989 and among the worst in franchise history by record alone. Realistically, it's the low point considering Dallas was coming off a division title and a playoff win, and was expected to contend for the Super Bowl that'll be held at Cowboys Stadium.
Phillips' departure takes another dubious spot in club history: the first in-season coaching change.
The first game under Garrett will be at the New York Giants on Sunday.