Sad news for Drew Barrymore and her family: ABC 10 reports that a woman believed to be the famed actress' half-sister was found dead in a car in National City, Calif., around 6AM on Tuesday (July 29). Jessica Barrymore, 47, and Drew have the same father, actor John Barrymore.

The site reports that Marta Lopez was trying to go to work on Tuesday, but a car blocked her from leaving. She allegedly asked if the woman in the front seat needed help, but there was no response. According to ABC 10, it was then that Lopez noticed "dozens of white pills" scattered around the woman and called the police.

"Her car was parked right here last night around midnight," neighbor Oscar Sandoval told ABC 10. "I thought she was sleeping or waiting for someone."

Late Tuesday, Medical Examiner's Office confirmed to ABC 10 that firefighters responded and found the woman dead. They also confirmed that the body was identified as Jessica Barrymore, whose date of birth was listed as July 31, 1966. This is the same birthday as Drew's half-sister. Jessica's cause of death remains unknown at this time.

"Although I only met her briefly, I wish her and her loved ones as much peace as possible and I'm so incredibly sorry for their loss," Drew said in a statement to the Daily Mail (quote via New York Daily News).

PopCrush sends our thoughts to Drew and the Barrymore family during this difficult time.

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