The two were spotted on a date more than a week before she was found dead.
Cathriona White and Jim Carrey were in high spirits on what may have been their final date before she was found dead in an apparent suicide.
A source tells ET the two looked smitten as they gazed adoringly at each other, hugged and kissed on a secluded balcony table overlooking the ocean at Nobu restaurant in Malibu, California, on Sept. 19," where they spent about two hours.
According to the source, Carrey and White constantly looked into each other's eyes, both initiating PDA throughout the night.
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"They looked really happy together," another onlooker tells ET, saying the actor and photographer seemed to be sharing "a very romantic meal."
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Cathriona shared two photos from the evening. "Before going for a wonderful belated birthday dinner at Nobu in Malibu last night," she captioned her selfie. She also shared a picture of the iconic Nobu menu.
Nine days later, White was found dead in her home on Monday night, Carrey reportedly visited with her sister on late Wednesday night. The 53-year-old actor was seen publicly for the first time since White's death on Thursday afternoon, when he was being driven en route to his Los Angeles, California home.
"Jim is doing everything he can to help," a source tells People of Carrey helping White's family during this difficult time. "He is devastated, but can't imagine how her family must feel."
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Following the news of White's death her family released a statement to the Irish Independent.
"The family of Cathriona White sincerely regret the untimely passing of their beloved daughter and sister," they said. "Cathriona was a shining light in our lives who was loved deeply by her entire family. We will miss her terribly and at this difficult time we ask to be left in private to mourn our loss."
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"She was a truly kind and delicate Irish flower, too sensitive for this soil, to whom loving and being loved was all that sparkled," Carrey told ET in a statement on Tuesday. "My heart goes out to her family and friends and to everyone who loved and cared about her."
It is unclear whether Carrey was still dating White at the time she died. The actor was spotted out at a Hollywood art show on Sept. 24, four days before White was found dead. A source tells ET that Carrey spent most of the night chatting in small circles, but was "definitely acting single," and TMZ reports this as the day the two split up.
White’s death remains under investigation. Assistant Chief Coroner Ed Winter tells ET that several notes were found at White’s home, including one addressed to Carrey.
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If you or someone you know needs help, please call the National Suicide Prevention Lifeline at 1-800-273-TALK (8255).