An MS-13 street gang member known as "Animal" was sentenced to 40 years in prison, according to the officials.

Joel Martinez, 23, admitted in December to killing a teenage boy in Massachusetts in 2015. As reported by the NY Post, the US Attorney’s Office in Massachusetts announced that Martinez would be deported as soon as he's released from federal prison.

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

"I stabbed the culero [wuss] three times," the 23-year-old said in the secret audio recording, according to the US Attorney's Office, "He stared at me, and he asked me if I was going to, if I was going to stab him. I told him, 'Yes, the Mara rules you.'"

Posted by the Boston Globe, the video shows the informant coaxing the confession out of Martinez. There is also an initiation ceremony recorded, in which Joel Martinez is made "full member of MS-13's Eastside Loco Salvatrucha (ESLS) clique in East Boston."

NY Post reports that Martinez’s lawyer suggested his client receive 30 years in prison because he was "forced to join the gang under duress."

Source: nypost.com