Just moments before stepping on the medal podium title at the World Athletics Championships in London, a protest by Ryan Crouser was thrown out.
Olympic champion Crouser, who finished sixth, had an effort of 22.31m red flagged during the third round of the final, which would have won gold.
Crouser has told the BBC he intends to fight the decision, telling the British broadcaster that he is looking for side footage of his third throw.
Yesterday second-placed American Joe Kovacs also launched a protest after his final throw of 22.08m was red-flagged.
Walsh won the event with a best throw of 22.03m.
Walsh received his gold medal this morning as the New Zealand national anthem was played at the London Olympic Stadium for the first time.
Female shot putter Dane Valerie Adams was denied the chance to hear the New Zealand anthem ring out in 2012 after finishing second behind drug cheat Nadzeya Ostapchuk.
Adams received her medal at a presentation in Auckland a week after the Games.
