Jennifer Aniston's mother, Nancy Dow, has passed away.

"It is with great sadness that my brother John and I announce the passing of our Mother Nancy Dow. She was 79 years old and passed peacefully surrounded by family and friends after enduring a long illness," Aniston said in a statement to People. "We ask that our family’s privacy be respected as we grieve our loss."

"No matter how complicated and difficult the relationship between Nancy and Jennifer may have been, it is heartbreaking for any daughter to lose her mother," a source close to the family tells the mag. "Nancy fought a very long battle, with many ups and downs, and Jennifer is grateful for the happy times they shared. She is pulling close to her husband and family and feels so supported by their love."

In a January 2015 interview with The Hollywood Reporter, Aniston briefly touched on her relationship with her mother, describing her as being "gorgeous" and "stunning" but "very critical."

Dow suffered a stroke in 2011, and she had a second stroke in 2012.