A mother of an autistic teen received an anonymous hateful letter saying that her son was a 'wild animal' and the "'right thing to do is to euthanize" him.

The Ontario-based family is shocked by the letter addressed to their 13-year-old son, Max, who was diagnosed with severe autism at the age of two. The letter was mailed to Max's grandmother's house at New Castle, where he spends most of the summer mornings.

The photo of the anonymous letter, signed as "one pissed off mother," was posted on Twitter by the famed YouTube duo Lennon and Maisy, who claim to be friends of the family.

"Crying babies, music and even barking dogs are normal sounds in the residential neighbourhood!!!!! He is NOT!!!!!!!" the letter read referring to the 'noises' Max makes. The anonymous writer further suggested that the boy was not "good to anyone" and the parents "should take whatever non retarded (sic) body parts he possesses and donate it to science."

The letter shattered Max's mother, Karla Begley, and left her in tears. "The more you go on, the worse it gets. Who says that about a child?" she told Toronto-based news channel, CityNews.

The Begley family told CityNews that they informed police about the hateful letter and if possible would press charges. The neighbors of Begleys have united in support of Max and are coming together to make him feel comfortable in the community.

Durham Regional Police spokesperson Jodi MacLean told Yahoo! Canada News that the department is taking the letter "seriously" and are investigating the matter. "We are consulting with the Crown to see if there is any criminality that went on with the letter," MacLean said.

The original Twitter post of the letter was retweeted over 6,500 times and generated support from Twitteratti across the world.