Who is Tammy Tyrrell, the former Jacqui Lambie senator who just defected to Labor?

Addition of Tasmanian crossbencher means Labor has gained a seat in the Senate – but still doesn’t have a majorityFollow our Australia news live blog for latest updatesGet our breaking news email, free app or daily news podcastFormer Jacqui Lambie ally Tammy Tyrrell has defected to the Labor party,