Labor senator Kimberley Kitching has died suddenly at the age of 52 from a suspected heart attack. Colleagues and friends have begun sharing tributes on social media, with Labor leader Anthony Albanese saying the party was in shock at the tragic news. “My sincere condolences to her family. Kimberley will be missed by us all,” he said on Twitter. Former Labor leader Bill Shorten said Senator Kitching suffered from “a heart problem” on Thursday evening in Melbourne and died soon after. Shorten said her passing was an immense loss to Labor and the nation. “To know Kimberley was to be touched not just by her serene intellect but her incredible warmth and vivacity,” he said in a statement. “As a Labor senator, she was relentlessly energetic and conscientious recently resulting in international recognition for her human rights work. “Our hearts go out to her husband Andrew, her family and loved …