>> reporter: so you at least had some time. maybe. >> maybe. >> dave tells me that they had received a letter and the letter had mentioned me. >> reporter: roberto's brother eduardo. >> he says be careful. watch yourself. >> reporter: but it wasn't just eduardo in the crosshairs. the letter writer claimed whoever was now driving roberto's now repaired pickup truck, that white f-250 the bomber wrote, is in great danger. and who was that person? roberto ayala's son, jesus. the threat against the ayalas was looking very real. >> it was real. it didn't just look real. it was real. a lot of sleepless nights. >> reporter: because this ex-marine not only had a farm to run but as he saw it a murder to solve, and now two families to protect. >> going through my mind was