Kerry and Rory Kennedy pay tribute to niece, who died aged 42 at her Massachusetts home

Kerry Kennedy said 'our family is heartbroken', and Rory Kennedy called her niece 'a wonder'. Kyle Kennedy was the daughter of Michael Kennedy, the sixth of Bobby and Ethel Kennedy's 11 children. Her father died on New Year's Eve 1997 after a skiing accident in Aspen. He left Kyle, Michael Jr and Rory, all under 15, behind.

Michael smashed into a tree while playing a daredevil game of ski football.

Rory Kennedy tried to save her brother with CPR, but he died within two hours.

Kerry Kennedy's new book says Michael was 'Mum's favorite'.