Julia Roberts reportedly didn't attend her late half-sister's memorial service yesterday (08.03.14).

The 46-year-old star had a ''complex'' relationship with Nancy Motes, who died from an apparent drug overdose last month, and was no where to be seen at the ceremony held for her this weekend.

However, 'Glee' star Jane Lynch and other co-workers were among the mourners at the service for Nancy, who was a production assistant on the Fox show, according to the MailOnline.

Nancy reportedly resented Julia for her fame and success, and left a ''ranting'' note prior to her death allegedly claiming the actress had driven her to suicide.

Nancy's fiancé John Dilbeck, said: ''Nancy was proud of Julia but she had severe abandonment issues.

''She had a knee operation as a teen and piled on weight because she couldn't exercise. While her sister was the 'Pretty Woman', Nancy was an overweight, insecure teenager.

''Nancy was a tortured soul. She grew up in the shadow of a superstar as a sister and Julia's fame cast a cloud over her life.

''Nancy adored Julia but she became increasingly resentful of the way Julia behaved towards her. In Nancy's mind Julia was a bully.''

It was previously reported the 'August: Osage County' star tried to make Nancy go to rehab to seek help for her addiction to drugs a few months prior to her death, but she ''backed out'' shortly before she was due to enter the facility.

A source said last month: ''Julia is taking the death very hard. It's extremely difficult for her because it didn't have to happen.''