Arizona Cardinals safety Tyrann Mathieu picked off a pass late in last night's win over the Philadelphia Eagles, but quickly fell to the ground after the interception.

Mathieu, who has had a great season in his 3rd year out of LSU, had to be helped off the field by trainers.

An MRI this morning revealed he has a torn right ACL and is done for the season.

It's tough news for both the 12-2 Cardinals, who won the NFC West division last night, as well as Mathieu, who was in the midst of an All-Pro season.

Through 14 games, Mathieu, aka the "Honey Badger", set career-highs in tackles (89) and interceptions (5).

Arizona head coach Bruce Arians made the announcement today at a press conference, nearly coming to tears on several occasions. He has stated several times Mathieu is his favorite player on the roster.

Two years ago, Mathieu missed the Cardinals last month of the season after suffering a left ACL and LCL tear on December 8th, 2013. He fully returned to Arizona's lineup in week 5 of the 2014 season.