Los Angeles: Actress Julia Roberts' mother Betty Lou Bredemus has passed away at the age of 80.

Lou Bredemus died Thursday morning. Her death occurred just one year after Julia lost her half-sister, Nancy Motes.

She had been suffering from lung cancer. Lou Bredemus, who used to be an acting school teacher, is survived by her children Eric Roberts, Julia and Lisa Gillan.

She once ran an acting school in Smyrna, Georgia. Her first husband, Walter Grady Roberts, with whom she has Julia, died from throat cancer when the actress was just 10 years old.

Julia, currently filming 'The Secret in Their Eyes', hasn't issued any comment yet on her mother's death.

It is also not known when and where her mother will be buried.