Peter Thulin, 19, was arrested on a warrant on charges of conspiracy to commit assault and attempt to commit assault, according to the article.
Earlier this month, it was reported that police arrested 18-year-old Natalie Carpenter, also of Torrington, on the same charges when the plot was discovered in her diary.
Thulin and Carpenter are both reportedly residents of a group home for people with mental illness. The two have no known connection to Danbury High School.
Carpenter pleaded not guilty to the charges and was held on $300,000 bond, according to the article.
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