Police release new details in Gilbert mass shooting

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GILBERT, Ariz. (AP) -- Police say they believe a former Marine with ties to neo-Nazi and Minutemen groups is responsible for shooting four people and taking his own life in a suburban Phoenix home.

Gilbert police spokesman Sgt. Bill Balafas says police believe Jason Todd Ready was the gunman in Wednesday's shootings in a home in Gilbert.

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, and carrying assault rifles.