Jurors began deliberations in Phoenix's Baseline Killer case on Wednesday morning.
Maricopa County Superior Court Judge Warren Granville explained the verdict forms and instructions with jury members Wednesday morning before they began deliberating.
Defense attorneys for 47-year-old Mark Goudeau made their closing arguments in the four-month trial Tuesday, followed by a rebuttal from prosecutors.
The former construction worker has pleaded not guilty to nine killings in the Phoenix area and dozens of other crimes in 2005 and 2006.
Goudeau is facing 72 counts in all.
If jurors find Goudeau guilty of any one of the nine murders, he could face the death penalty.
Authorities named the crimes after Baseline Road in south Phoenix where a number of the earliest attacks occurred.
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