Actress Sondra Locke, who dated Clint Eastwood for 13 years in the '70s and '80s, has died, reports RadarOnline.com. She was 74.

Locke’s cause of death was cardiac arrest stemming from breast and bone cancer, according to a death certificate obtained by the site.

She passed away November 3 and was later laid to rest at Pierce Brothers Westwood Village Memorial Park & Mortuary.

Locke had previously battled breast cancer, and had a double mastectomy in 1990.

Locke was nominated for a Best Supporting Actress Oscar for her film debut, 1968's “The Heart Is a Lonely Hunter.” She met Eastwood in 1972, and became involved with him during the making of "The Outlaw Josey Wales" (1976). She also starred with him in "The Gauntlet" (1977), "Every Which Way but Loose" (1978), "Bronco Billy" (1980), "Any Which Way You Can" (1982), and "Sudden Impact" (1983).

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