Prominent Christian televangelist and anti-vaccine advocate Marcus Lamb died after being hospitalised with Covid-19, his family announced Tuesday.

Lamb founded Christian television network Daystar Television Network in 1997.

His wife Joni Lamb, announced the televangelist's death on Daystar's programme streamed to Facebook Tuesday. She said her husband had diabetes but was healthy and was hospitalized after being diagnosed with Covid-19.

"He never talked about that, but he had diabetes, but he kept it in check. He was very healthy, he ate healthily, he kept his weight down, and always kept his sugar at a good level. But with trying to treat Covid and pneumonia, the different protocols that are used, including many of the protocols we talked about here on Daystar, and we used those, and I used them and breezed through Covid.

It caused his blood sugar to spike and just a decrease in his oxygen and that's why he went to the hospital, so he could have oxygen," Joni Lamb said.

"He 100% believed in everything that we've talked about here on Daystar and helping so many people around the world with early protocol treatments for Covid. We still stand by that, obviously." Joni Lamb said her husband's "heart just gave out."

Marcus Lamb often spoke out against the Covid-19 vaccines on his show. In an episode earlier this year featuring anti-vaccine activists Robert F. Kennedy Jr. and Del Bigtree, Lamb said the Covid-19 vaccine was "not really a vaccine," but an "an experimental shot" that was "dangerous. Marcus Lamb alleged that people were dying or having neurological disorders from the vaccine.

Joni Lamb described the illness as "riding a roller coaster" on that same episode. She asked people in November to "pray specifically for [Lamb's] lungs to clear, Covid pneumonia, and pray for his oxygen levels to continue to be strong and to go up and so that we can wean him off of oxygen and then bring him home."

A statement from Daystar Television Network said in part, "the family asks at this time that their privacy be respected as they grieve this difficult loss, and they wish to express their deep love and gratitude for all those who prayed during Marcus's health battle. Continue to lift them up in prayer in the days ahead."