All media reports suggest she collapsed at some point while at court on Friday afternoon, and was pronounced dead a few minutes later.
They defended Hollister, who wanted to turn the 20,000 square-foot property into a boutique hotel with the nun's blessing, but has now been forced to declare bankruptcy.
"We extend our prayers today to the Immaculate Heart of Mary community and to all her friends and loved ones". Her bid had the approval of Los Angeles' archbishop.
Upon learning of this, the nuns from The Sisters of the Immaculate Heart of Mary claimed the LA Archdiocese didn't have the rights to sell the Los Feliz convent to Perry for $14.5 million.
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The "Firework" singer previous year won a legal battle against two nuns and restaurateur Dana Hollister.
A Los Angeles judge ruled that the nuns' efforts to sell the property were "improper", allowing Katy to purchase the convent - if the Vatican were to approve.
Perry was awarded $5 million, while the Archdiocese received $10 million.
A few hours before her death Sister Catherine spoke to Fox 7 News in which she urged Katy to fall back on the legal battle. "It's not doing anyone any good except hurting a lot of people", Holzman had earlier told KTTV as she entered the courthouse with Sister Rita Callanan.
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Another of the nun's concerns is with the singer herself. In November of a year ago, a jury found that Hollister had intentionally interfered with the sale to Perry and a judge ordered her to pay millions to the archdiocese and the singer.
Prior to all the court proceedings, Perry met with Sister Callanan and Sister Holzman by invitation of Archbishop José at the convent and sung "Oh Happy Day" to them.
"Katy Perry represents everything we don't believe in", Holzman said in the interview. Holzman later added, "And to Katy Perry, please stop". However, the sisters preferred Hollister's offer as it was more at $15.5 million and they had a stronger bond with her.
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