Drew Barrymore's Half Sister Jessica Probably Overdosed, Says Brother

The half sister of Drew Barrymore, whose body was found in a car early Tuesday, likely died from an accidental overdose, her brother told a New York newspaper.

“It looks like it was a drug misadventure. Mixing alcohol and pills. I seriously doubt she took her own life,” John Barrymore, 60, told the New York Daily News. (Drew, Jessica and John all share the same father, John Drew Barrymore.)

Drew's Dad, John D. Barrymore, Dies at 72

Sporadic actor John Drew Barrymore, perhaps best known as the absentee father of Drew Barrymore, died Monday in Los Angeles. He was 72.

No cause or details of his passing were released.

In a statement issued by her publicist, Drew, 29, said: “He was a cool cat. Please smile when you think of him.”

John Drew Barrymore’s parents were actress Dolores Costello and the fabled John Barrymore, who was part of a stage and screen dynasty that included brother Lionel Barrymore and sister Ethel Barrymore.