Police believe Jason "JT" Ready is responsible for shooting four people and taking his own life in a suburban Phoenix home. Authorities say that the four others killed were 15-month-old Lily Lynn Mederos; 23-year-old Amber Nieve Mederos; 47-year-old Lisa Lynn Mederos and 24-year-old Jim Franklin Hiott.
Media reports say Lisa Mederos was Ready's girlfriend and Amber and Lily were her daughter and granddaughter.
Ready was known in Arizona for organizing a militia in the desert with the goal of finding illegal immigrants and drug smugglers. The 39-year-old outfitted himself with military fatigues, body armor and gas masks. He also carried assault rifles. Police say he was a former Marine with ties to Neo-Nazi and Minutemen groups.
This undated file photo shows Jason "JT" Ready posing with an assault rifle.
Shooting victims Jim Franklin Hiott, left, Lily Lynn Mederos and Amber Nieve Mederos are seen in this undated family photo.