His company, which initially suspended him, said Sunday that Hundley no longer has his job.
In 2007, Hundley pleaded guilty to a misdemeanor assault charge filed in Virginia, according to court records.
Joe Rickey Hundley of Hayden, Idaho, was charged with assaulting a minor in the February 8 incident.
The only other opening day slam in Mets history was hit by Todd Hundley on April 26, 1995, at Colorado.
Reached by phone Friday, Joe Rickey Hundley of Hayden, Idaho, declined to comment to CNN and referred inquiries to his attorney.
But he said Monday they believe Hundley should be punished beyond the loss of his job and possible one-year federal prison sentence.
The 33-year-old mother then says Hundley slapped her son in the face.
FORBES: Man Allegedly Strikes Toddler on Airplane: What Was He Thinking?
Hundley was also charged with simple assault, and if convicted of the misdemeanor count, he faces a maximum term of one year in prison.
FORBES: Man Allegedly Strikes Toddler on Airplane: What Was He Thinking?
Then Hundley, who was seated next to the mother and son, allegedly told her to "shut that ('N word') baby up, " according to court documents.
Hundley's attorney, Marcia Shein, said her client is being unfairly portrayed.
Hundley has since been suspended from his job pending the investigation.
Joe Rickey Hundley, 60, is accused of hitting a crying toddler on a Delta Airlines flight, after twice referring to the child with a racial slur.
FORBES: Man Allegedly Strikes Toddler on Airplane: What Was He Thinking?
Hundley then turned around and slapped the 2-year-old in the face with an open hand, which caused the child to scream even louder, the affidavit said.
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