Picture Emerges of 3rd Man Allegedly Linked to Boston Shooting

FBI says Nicholas Rovinski conspired with others to kill conservative blogger.
2:05 | 06/13/15

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Transcript for Picture Emerges of 3rd Man Allegedly Linked to Boston Shooting
right out of your hair, Amy. Thank you. To the new arrest tonight, the suspect looking for the boy next door. Questions about what allegedly inspired him to work with Isis. Brian Ross with the details. Reporter: The FBI moved in at sunset. The accused Isis terrorist, 24-year-old Nicholas rovinski. This was rovinski just six years ago when he graduated high school, a bright future ahead. A seemingly unlikely target given his online persona as a struggling musician, with a pretty friend, into health foods. But now friends and neighbors in this quiet neighborhood in Warwick, Rhode Island, learned the boy next door, rovinski, was, according to the FBI, leading a second, secret life. It's scary. Real scary. Reporter: In court documents, the FBI said rovinski had taken an arabic name, nuh amriki, converted to Islam, and studied this online video which showed how to make a machete without power tools. And here's the final product. Reporter: He later told the FBI innocent Americans should die. Isis' strategy of reaching into the United States through their propaganda is working, they're able to mobilize people in this country to carry out these types of attacks. Reporter: The FBI says rovinski is tied to the man seen in this dramatic video, lunging at an FBI agent and a Boston police officer with a military knife. Usaamah Rahim, just moments before he was shot and killed. The FBI says in the days before that incident, rovinski and Rahim met on a secluded Rhode Island beach and first hatched a plan to they first planned to kill, behead, the New York woman who had organized a display of cartoons of the prophet Mohammed. But the target later shifted to police. In court today, his mother left without comment. Unable to account for how her son apparently decided he would go to war with America, Amy. Brian, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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