the connecticut elementary school under assault. within minutes, six adults and 20 children massacred. just three days later, another school, this one in florida, goes into lockdown. and miami-dade police negotiator victor millian is called into action. part of the information i received was that there were multiple weapons involved, to include grenades. reporter: the shooter isn t in a school, but across the street, living here. he s distressed and heavily armed. inside his apartment, the walls are covered with violent rantings, and silhouettes used for target practice. his name is franklin rosario. earlier that day, his sister, alma, sent this desperate e-mail
reporter: december 14, 2012, the connecticut elementary school under assault. within minutes, six adults and 20 children massacred. just three days later, another school, this one in florida, goes into lockdown. and miami-dade police negotiator victor millian is called into action. part of the information i received was that there were multiple weapons involved, to include grenades. reporter: the shooter isn t in a school, but across the street, living here. he s distressed and heavily armed. inside his apartment, the walls are covered with violent rantings, and silhouettes used for target practice. his name is franklin rosario. earlier that day, his sister,
school under assault. within minutes, six adults and 20 children massacred. just three days later, another school, this one in florida, goes into lockdown. and miami-dade police negotiator victor millian is called into action. part of the information i received was that there were multiple weapons involved, to include grenades. reporter: the shooter isn t in a school, but across the street, living here. he s distressed and heavily armed. inside his apartment, the walls are covered with violent rantings, and silhouettes used for target practice. his name is franklin rosario. earlier that day, his sister, alma, sent this desperate e-mail that alerted authorities.
multiple weapons involved, to include grenades. reporter: the shooter isn t in a school, but across the street, living here. he s distressed and heavily armed. inside his apartment, the walls are covered with violent rantings, and silhouettes used for target practice. his name is franklin rosario. earlier that day, his sister, alma, sent this desperate e-mail that alerted authorities. i lived with him and have seen his suicide note written on his wall at home. and he has personally told me about plans he has to do mass public shootings. what were your immediate concerns as soon as you got there? as i m pulling up to the scene, there s a private school across the street. reporter: the police special response team surrounds the area, as millian begins talking to rosario. he had on body armor when i was talking to him through the window. i saw the butt of a rifle. so i knew danger was there. reporter: and he knew rosario suffered from mental illness.
just three days later, another school. this one in florida, goes into lockdown. and miami-dade police negotiator victor millian is called into action. part of the information i received was that there were multiple weapons involved, to include grenades. reporter: the shooter isn t in a school, but across the street, living here. he s distressed and heavily armed. inside his apartment, the walls are covered with violent rantings, and silhouettes used for target practice. his name is franklin rosario. earlier that day, his sister, alma, sent this desperate e-mail that alerted authorities. i lived with him and have seen his suicide note written on his wall at home. and he has personally told me about plans he has to do mass public shootings. what were your immediate