Jim Carrey Spotted Out 4 Days Before Late Girlfriend Cathriona White's Death

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Jim Carrey was out at a Hollywood art show on Sept. 24, four days before his late girlfriend, 30-year-old Cathriona White, was found dead from an apparent suicide.

The 53-year-old actor, an avid art collector, attended the show for multimedia artist BLAKHAT last Thursday, and showed up solo. A source tells ET that Carrey spent most of the night chatting in small circles, but was "definitely acting single" when it came to making eye contact with other women in the hip crowd. Pictures of Carrey at the event appear to show him in good spirits.

WATCH: Jim Carrey and Late Girlfriend Cathriona White -- A Timeline of Their Relationship Over the Last 3 Years

Still, the source says Carrey "seemed anxious and almost a little paranoid" at times, before abruptly leaving the party. According to TMZ, Sept. 24 is also the day when Carrey and White split.

However, the on-again/off-again couple definitely appeared to be on-again when they were spotted together at Gracias Madre in Los Angeles on Sept. 18. A source at the restaurant tells ET they seemed like a couple, holding hands at one point. "They looked happy," the source adds. "Very polite and really sweet."

Carrey and White appeared to have rekindled their relationship in March 2015, after first being linked in September 2012.

Meanwhile, assistant Chief Coroner Ed Winter tells ET that the note that was retrieved where White's body was found on Monday at her Sherman Oaks, California residence, does include Carrey's name. Winter says he has not seen the letter, and therefore, is not certain if the letter was addressed to Carrey himself.

Pills were also located at the scene, and officials tell ET White may have died of a possible overdose.

NEWS: Cathriona White's Final Note Includes Jim Carrey's Name, Pills Found by Her Bed, Coroner Says

"I am shocked and deeply saddened by the passing of my sweet Cathriona," Carrey said in a statement to ET on Tuesday. "She was a truly kind and delicate Irish flower, too sensitive for this soil, to whom loving and being loved was all that sparkled. My heart goes out to her family and friends and to everyone who loved and cared about her. We have all been hit with a lightning bolt."

If you or someone you know needs help, please call the National Suicide Prevention Lifeline at 1-800-273-TALK (8255).