PHOENIX, Arizona (AP) -- Two men charged with more than a dozen shootings that terrorized the Phoenix area for months pleaded not guilty Monday to charges of murder and attempted murder.
Dale Hausner, 33, and Samuel Dieteman, 30, entered their pleas via a video link during a brief hearing.
Each is charged with two counts of first-degree murder and 14 counts of attempted murder.
The two former roommates also pleaded not guilty to 14 counts of aggravated assault and 16 counts of drive-by shooting in connection with the 16 victims.
Their attorneys declined to comment after the hearing.
Hausner and Dieteman are being investigated in a total of 37 shootings incidents stretching back to May 2005.
Seven people were killed during the shooting series and 17 wounded. Several animals also were shot.
In a jailhouse interview, Hausner said he was innocent but that it was possible his roommate was responsible for the shootings. Dieteman refused interview requests.
Police said they have learned that Dieteman told acquaintances about the serial shootings that claimed seven lives since May 2005.
According to court documents, Dieteman told police that he and Hausner were involved in some of the shootings. Dieteman called them "RV" -- "random recreational violence."
Police searching Hausner's apartment found guns and ammunition, newspaper clippings about the serial killer investigation and maps showing locations of previous shootings.
A task force is still searching another shooter, dubbed the "Baseline Killer," who is suspected in at least six shootings in the Phoenix area over the past year.