GILBERT, Ariz. -- Police said Wednesday's shooting in Gilbert that left five people dead, including a baby, was a domestic-violence situation.
They also identified those killed and said their investigation is leading them to believe this was a murder-suicide. It's not yet clear what happened in the hours and minutes leading up to the shooting.
One of those killed, the man believed the shooter, was a former Marine with ties to neo-Nazi and Minutemen groups.
Jason Todd Ready, 39, organized a militia in the Arizona desert with the goal of finding illegal immigrants and drug smugglers.
Known as "J.T.," Ready led an outfit known as the U.S. Border guard that dressed in military fatigues and body armor and carried assault rifles during patrols for illegal immigrants in the desert south of Phoenix.
The four others killed in Wednesday's shootings in a home in Gilbert include 16-month-old Lily Lynn Mederos, 23-year-old Amber Nieve Mederos, 47-year-old Lisa Lynn Mederos and 24-year-old Jim Franklin Hiott.
While there was some early speculation that Wednesday's mass killing was a hit by a drug cartel, police firmly shut down that theory during a Thursday morning news conference.
While it is still early in the investigation, Gilbert police spokesman Sgt. Bill Balafas explained what detectives know so far.