"When we arrested her, she had heroin in her possession and she had a fully loaded needle with heroin in it," Santa Cruz Deputy Police Chief Steve Clark says. "That tells you she had every intention of maybe doing the same thing in what she thought was the date with us."
The 51-year-old tech executive died of a heroin overdose on his yacht in November. Santa Cruz police confirm to PEOPLE that camera footage from the yacht showed Tichelman, 26, injecting Hayes with the drug, then leaving him to die, finishing a glass of wine before exiting the boat.
"He falls to the floor of the boat and at that point she gets up and the first thing she does is to start cleaning up her stuff," Clark tells PEOPLE of the video, which has not been released. "She steps over the body to grab a glass of wine. It's the coldest thing I can think of."
"She picks up her stuff and you can see her look back in and realize, 'Oh, you can see from the outside of the boat,' so she reaches in and pulls the blind down on the window to conceal [the body]," he speculates. "Within a few days she's doing Google searches looking for information on this case and looking for ways to get herself out of it."
'Surprise, We're the Cops!'The Santa Cruz police ultimately apprehended Tichelman by posing as a rich client seeking sex.
"We set up a fake ID for one of our detectives here and made her believe that we wanted to spend the weekend with her here in Santa Cruz at one of our luxury resorts," Clark describes. "We met her in the lobby of the hotel and threw a big surprise party for her – surprise, we're the cops! – and arrested her at that point."
Hayes is allegedly not the first of Tichelman's conquests to have died in this manner. Her former boyfriend, Dean Riopelle, was hospitalized in Milton, Georgia, for a heroin overdose in September and died a week later, according to the Fulton County Medical Examiner.
According to a police report, Tichelman stated she tried to revive Riopelle after finding him passed out on the ground. She was not charged in connection with his death, which was ruled an accidental overdose. However, in light of her arrest in Santa Cruz, the case has been re-opened, says Clark.
"I think it's great that they're willing to do that and re-examine their case, especially in light of this new information," Clark says. "I think it's important for both of our departments. At the end of the day, we're both looking to learn the truth about our cases and as much information as possible. So we both have a mutual benefit in working together and looking into both circumstances."