Ellie Greenwich was praised throughout her songwriting career

American songwriter Ellie Greenwich, who penned River Deep, Mountain High and other hits, has died, aged 68.

She died of a heart attack after being admitted to a New York hospital for pneumonia treatment, her niece said.

In a 50-year career, she was awarded some 25 gold and platinum discs. She collaborated with Phil Spector on Chapel of Love and Da Doo Ron Ron.

She wrote Leader of the Pack with her ex-husband, which became the basis for a Broadway musical based on her life.

Greenwich was a member of the Songwriters Hall of Fame and contributed to the success of many stars, including working with Frank Sinatra and Ella Fitzgerald.

She is also co-produced songs for Neil Diamond, including his hit Kentucky Woman.

Other compositions included Do Wah Diddy Diddy and Look of Love.