A member of the notorious MS-13 street gang who goes by the street name, “Animal,” admitted to the 2015 killing of a teenage boy in Massachusetts and was sentenced to 40 years in prison, officials said Tuesday.

The U.S. Attorney’s Office in Massachusetts announced, Joel Martinez, 23, who went by the moniker “Animal,” will be subject to deportation once he’s released from federal prison.

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The U.S. Attorney’s Office said that Martinez was secretly recorded by a cooperating witness where he acknowledged being a member of MS-13 and admitting his role in the killing. The video, posted by the Boston Globe, shows the informant coaxing the confession out of Martinez. source

Martinez pleaded guilty in December to RICO conspiracy and admitting to stabbing 15-year-old Irvin Javier de Paz Castro to death on Sept. 20, 2015, according to prosecutors.