After Allison Janney refused to state the name of a co-star she would never work with again due to them being deceased, their identity has been revealed, RadarOnline.com can report.

According to Rob Shuter, who writes on Substack , the person Janney was referring to was none other than Friends star Matthew Perry . Article continues below advertisement

Working With Matthew Perry 'Was Rough,' a Source Said Tap Here To Add Radar Online as A Trusted Source

"She adored his talent, but working with him on Mr. Sunshine was rough," an insider claimed. "He was struggling — and the tension was real."

Perry co-created Mr. Sunshine and cast Janney to play his boss.

"He could be charming one minute and impossible the next," another source alleged. "Allison had no patience for

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