Police allege Hayes was a client of Tichelman, who met him one night in November on his yacht in a local harbor. Security video from the yacht purportedly shows Tichelman preparing a dose of heroin and injecting Hayes with it. He is then seen having an adverse reaction to the dose, collapsing and becoming unconscious.
Rather than trying to help or calling 911, police say, Tichelman packed up the drugs and needles and at one point stepped over the body to finish a glass of wine before leaving.
Police say she tried to wipe her prints off the glass and closed the yacht blinds so no one could see inside.
Hayes' body was found the next morning by the ship's captain.
"She's cold. Ice cold," said Santa Cruz police Deputy Chief Steve Clark. "The only person Alix Tichelman cares about is Alix Tichelman."
The circumstances of Hayes' death have prompted police in Georgia to reexamine the case of 53-year-old Dean Riopelle, who died in the presence of Tichelman in Atlanta in 2013.