Prosecutors say 27-year-old Elizabeth Amirian's feet were bound. She was found dead from multiple stab wounds inside a minivan.
A deputy on patrol allegedly saw the stabbing in progress, and took Wagstaff into custody after shooting him with a Taser.
Wagstaff faces allegations of special circumstances, that the murder occurred during the commission of a rape and a kidnapping. Wagstaff's not-guilty plea means he could face a possible death sentence if convicted.
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