Mark Burton amended the wrongful death suit which he filed against Carrey. In the new documents he said Cathriona had a text conversation with Carrey in February 2013 where she told him she thought she had contracted an STD, reported TMZ.
In the documents, Burton said Cathriona got tested and discovered she had Herpes Type I, Herpes Type 2 and Gonorrhea.
He said Carrey, 54, tried to pressure her to keep quiet about it, which she did.
She also referred to herself as "damaged goods."
Burton's lawsuit also included text messages which he said Carrey and Cathriona exchanged in 2013, including the ones referencing the STDs.
Carrey hasn't commented on the news, but he said earlier this week that Burton's lawsuit was just a "heartless attempt to exploit me or the woman I loved.