Recruiting assistant Paul Brodie has resigned from GWS after the AFL's move to ban him for a betting offence.
Brodie was caught placing a $100 head-to-head multi bet on five matches in round 19, including one involving the Giants.
The league detected the successful bet, where Brodie won $945.
The AFL banned him on Thursday for 13 months until December 1 next year, prompting Brodie to quit the Giants.
Players, coaches and officials cannot bet on AFL matches.
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AFL general counsel Andrew Dillon said the bet was detected by their integrity department.
"I have made a mistake which has let the club down, let down my family and friends, and let myself down," Brodie said in a GWS statement.
"I am very sorry for the lack of respect I have shown for the rules and principles that maintain the integrity of our game.
"I will accept whatever sanction is imposed on me as an appropriate penalty.
"I have learned a serious lesson and hope others can also learn from my mistake."
