Diane Keaton’s cause of death has been confirmed by her family, four days after the legendary actress died unexpectedly at age 79 .

“The Keaton family are very grateful for the extraordinary messages of love and support they have received these past few days on behalf of their beloved Diane, who passed away from pneumonia on October 11 ,” the family said in a statement to People on Wednesday.

The Oscar-winning actress was pronounced dead at a hospital after Los Angeles Fire Department paramedics were called to her home shortly after 8 a.m. on Saturday for reports of a “person down,” TMZ reported, citing 911 audio.

Her death was confirmed later that day by a family spokesperson, who declined at the time to offer any further information.

A source previously told People that

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