A 'vaccines can kill' billboard that features the son of a former professional fighter, who blames his toddler's death on vaccinations, has been erected in Missouri. 

Twenty-month-old Nicholas Catone, of New Jersey, died suddenly in his sleep in May 2017, 17 days after receiving a DTaP vaccination, according to his parents.

The vaccination helps children younger than age seven develop immunity to three deadly diseases caused by bacteria: diphtheria, tetanus, and whooping cough.

But Nicholas' parents, former MMA fighter, Nick Catone and his wife Marjorie Madison-Catone, who has been a nurse for 12 years, believes their son's death was caused by the vaccination.     

Nicholas is now the face of his parent's campaign to bring awareness to families that 'vaccines can kill'.