(CNN) Anthony "T.J." Cunningham, a former Seattle Seahawks player and assistant principal at a Colorado high school, has died after being shot during a parking dispute, the Arapahoe County Sheriff's Office said.

Cunningham, 46, an NFL safety during the 1996 season, was shot by a neighbor early Sunday and taken to a hospital, where he died the next day, the sheriff's office said via Twitter.

The neighbor, Marcus Johnson, 31, was originally held on attempted murder charges, but the charges were amended to first-degree murder after Cunningham's death, authorities said.

It's not clear whether Johnson, who is being held without bond, has an attorney.

Cunningham texted Johnson hours before the shooting, sheriff's spokeswoman Deborah Sherman told CNN.

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