A new comedy show by Amanda Knox is hurtful rather than funny, the sister of the British student whose murder the American performer was convicted but later acquitted of told CNN ahead of its scheduled opening Friday at the Edinburgh Fringe Festival.

Knox, who shared the apartment where Meredith Kercher was murdered in Italy in 2007, maintains her solo comedy act is meant to “honor” Kercher’s memory. But Kercher’s sister does not see it that way.

“For a lot of people, Meredith’s murder is a part of cult history, something that happened decades ago,” Stephanie Kercher told CNN. “For her family and friends, the pain is part of every single day. And there is nothing funny about any of it.”

The show is called “Cartwheel,” a reference to the claim that Knox performed cartwheels in the police station after Kercher’s murder – and uses comedy as a way “to call out the violence that was done to her and to me,” Knox wrote on social media ahead of the show’s 11-night run. Knox spent nearly four years in prison before being released after an appeal in 2011.

It is her take at “approaching forty, juggling motherhood and finally getting around to being furious about the whole wrongful-imprisonment thing. Especially when half the world is telling her to get over it, while the other half still thinks she’s guilty.”