Former Labor MHA Madeleine Ogilvie will head back to Parliament after a recount on the seat left vacant by Scott Bacon.
She triumphed over former party candidate and radio personality, Tim Cox, by 203 votes.
She lost her seat in the 2018 election after the party's left faction backed the election of candidate Ella Haddad.
Ms Ogilvie, a member of the party's right faction, resigned from the party after the election and contested the seat of Nelson as an independent in a Legislative Council election this year.
She lead the recount early on which was triggered by the resignation of Mr Bacon last month after nine years in Parliament.
The recount involved the redistribution of almost 12,000 ballot papers.
Late in the afternoon, the recount became a three-way race between Ms Ogilvie on 4597 votes, Mr Cox on 4100 votes, and former Labor candidate Zelinda Sherlock on 1649 votes.
The recount involved eight candidates in total including two Greens candidates, one Liberal candidate, and two candidates from micro-party Tasmanians 4 Tasmania.
Labor leader Rebecca White earlier on Tuesday said she last talked to Ms Ogilvie about her participation in the recount a week ago.
She said the party's executive could decide whether to accept Ms Ogilvie's application if one was received during the night.