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Mark Goudeau was found guilty of killing nine people and various other crimes

He is called the Baseline Killer because his crimes occurred near Phoenix's Baseline Road

The crime spree began with robberies and sexual assaults, then escalated to murder

(CNN) —  

An Arizona jury found Mark Goudeau, the so-called Baseline Killer, guilty Monday of killing nine people.

Goudeau was also found guilty on a variety of other charges, including sexual assault, armed robbery and kidnapping.

Jurors found that Goudeau, already serving a 438-year sentence for a 2005 rape connected to the Baseline Killer crimes, was eligible for the death penalty after agreeing with prosecutors that the murders were especially cruel.

According to police, the crime spree began with robberies and sexual assaults, then escalated to murder.

Many of the crimes occurred near Phoenix, Arizona’s Baseline Road, hence Goudeau’s moniker.