Dale Hausner, 33, has been jailed since last week on two counts of first-degree murder and 14 counts of aggravated assault in 37 shootings that killed seven people and injured 17 others. His roommate, Samuel Dieteman, 30, faces the same charges.
In an interview with the Arizona Republic, Hausner said he didn't do anything wrong.
"Apparently at night Sam had been taking my car out, using various weapons I have at my house to commit crimes," Hausner said. "And apparently they tracked it to my car and, when they came and busted in the house, I was there, and I guess I'm just guilty by association, even though I did not shoot anybody or kill anybody."
Robert Keppel, a detective with years of experience investigating serial cases, said Hausner's remarks were typical.
"He is being dominant," Keppel said. "He is power-hungry and he wants nothing but to make everyone else look like they are wrong. There are many like him in prison."