The victim's wife, Jennifer Sutcliffe, said that her husband decapitated the four-foot serpent with a shovel while working in the garden at their home near Corpus Christi.
When he tried to dispose of the snake, the snake's head bit him, pumping all the venom it had into him, Sutcliffe said.
Although being attacked by a severed snake head seems unusual, Sean Bush, a snake expert at the Brody School of Medicine at East Carolina University told NBC News in 2014 that it's "very common" for snake heads to still bite because it's "a last-ditch effort to survive". But. he started having seizures, lost his visions and began bleeding internally.
But his condition deteriorated so badly that an ambulance had to meet him en route, and he was later life-flighted to a hospital.
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"Some people are saying we deserve it, it's karma", Ms Sutcliffe said.
Because the head was severed from the body, the reptile is believed to have released an extremely large amount of deadly venom into her husband's hand.
Sutcliffe explained: 'A normal person who is going to get bit is going to get two to four doses of antivenom.
Sutcliffe, who called 911, was trying to drive her husband to the hospital, but his condition was so serious authorities had to fly him in for care. "He got all of the snake's venom in the bite".
Among their tips to avoid snake bites: never go barefoot or wear sandals in wild areas, watch your step and avoid tall grass. "He had to have 26 doses". As any hot-blooded Texan would, her husband promptly grabbed a shovel and beheaded the snake. Unlike a tiger, for instance, which kills prey by sinking its teeth into an animal's flesh and holding on, snakes aim to deliver just one, extremely quick bite and then move away from their prey before getting trampled.