Kathleen Danielson, 28

Kathleen Nancy Danielson died at home on June 19 of an apparently unintentional heroin overdose after a 10-year battle with addiction. A 2007 East Hampton High School graduate, she was 28.

In an effort to overcome addiction, Ms. Danielson had belonged to the Sunday Night Fight Club, sponsored by the Riverhead chapter of Alcoholics Anonymous, and also attended a Heroin Anonymous support group known as Spiritually Protected.

She was born in Riverhead on April 25, 1989, to Nancy and Kenneth Danielson and was living with her father in Hampton Bays at the time of her death. He had been a charter boat fisherman, and friends said she inherited his love of the outdoors, especially enjoying surfing, fishing, hiking, and skiing.

She also was a good cook and baker as well as a writer of poetry and a painter. She loved the Beatles, Pink Floyd, and Led Zeppelin. She and her boyfriend of many years, Jerzy Bialik, had recently become engaged.

Her father and a sister, Laura Danielson-Kreilling of Norwich, Conn., survive. Her mother died of cancer in 2014.

Memorial donations to help with final expenses have been suggested. They can be sent to Kenneth Danielson, 36 Wakeman Road, Hampton Bays 11946. Friends have been asked to check Ms. Danielson’s Facebook page for information about the dispersal of her ashes.