Kiwi rapper Todd Williams, known as Louie Knuxx, died of a heart attack two months ago in Melbourne.
The 42-year-old from New Plymouth was running on a treadmill in his home gym when he suffered the heart attack.
Now his family have revealed that they began to receive "disturbing messages" within days of his passing.
They told Sunday that Williams was a vocal supporter of vaccination and had had both his doses. Then anti-vaxxers started spamming his social media accounts suggesting that his death was due to the vaccine, reports 1 News.
His sister Liz told the broadcaster, "Somebody had said, 'Hey I'm good friends with Todd Williams' family and I know that he died from the vaccine, so do the family'.