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Explosive residue on the metal fragments we submitted. >> reporter: so it was a bomb, a murder. then the very next day -- >> i'm sitting in my office talking about what we're going to do next and the civil deputy walks in with a big manila envelope and he says, i think this is for you guys. it says colusa county sheriff's office, colusa, california, no street address, and in the upper left-hand corner it says ayala case and then there are eight stamps on it. it was pretty light. it was way too much postage. >> reporter: because inside was just a single sheet of paper. an open letter to the cop...

Office, colusa, california, no street address and in the upper left-hand corner says ayala case and then there are eight stamps on it. it was pretty light. it was way too much postage. >> reporter: because inside was just a single sheet of paper. an open letter to the cops. what did that letter say? >> basically it was claiming responsibility for the bombing. >> the letter full of misspellings and bad grammar had been written on a label maker, then photocopied. its author claimed to be a military trained contract killer who had been hired to kill roberto over a mexico deal gone wrong. >> that ...

On it. it was pretty light. it was way too much postage. >> reporter: because inside was just a single sheet of paper. an open letter to the cops. what did that letter say? >> reporter: basically it was claiming responsibility for the bombing. >> the letter full of misspellings and bad grammar had been written on a label maker then photo copied. its author claimed to be a military trained contract killer had been hired to kill roberto over a mexico deal gone wrong and that it was ms 13 behind it. >> reporter: what the heck is ms 13? >> it's a violent el salvadorian criminal street gang. >> rep...

On it. it was pretty light. it was way too much postage. >> reporter: because inside was just a single sheet of paper. an open letter to the cops. what did that letter say? >> reporter: basically it was claiming responsibility for the bombing. >> the letter full of misspellings and bad grammar had been written on a label maker then photo copied. its author claimed to be a military trained contract killer had been hired to kill roberto over a mexico deal gone wrong and that it was ms 13 behind it. >> reporter: what the heck is ms 13? >> it's a violent el salvadorian criminal street gang. >> rep...

Big manila envelope. says colasa county's sheriff's office. in the upper right hand corner, there's eight stamps on it. which, and it was pretty light. so it was way too muchpostage. >> inside, a single piece of paper. an open letter to the cops. what did that letter say? >> basically it was claiming responsibility for the bombing. >> the letter full of misspellings and bad grammar had been written on a label maker and photocopied. its author claimed to be a military trained contract killer who'd been hired to kill roberto over a mexico deal gone wrong. >> and that it was ms-13 behind it. >> w...