Parliamentary career

Matheson was selected as the Labour Party parliamentary candidate for the City of Chester in June 2013.^[10] After 7 May 2015, he gained the seat from Conservative Stephen Mosley with a majority of 93 votes, having the third smallest majority of a parliamentary constituency in the UK after the 2015 general election.^[11] In July 2015, he became a member of the Commons Culture, Media and Sport Committee.^[7]

In the 2015 Labour Party leadership election, Matheson nominated Andy Burnham to be leader of the Labour Party.^[12]

On 27 June 2016, Matheson resigned from his role as Justice Parliamentary Private Secretary, joining many members of Jeremy Corbyn's shadow team who resigned following the result of the EU referendum result.^[13] He went on to nominate Owen Smith for the leadership in the 2016 Labour Party leadership election.^[14][15] He rejoined the shadow cabinet team following the result and joined the shadow cabinet housing team as Parliamentary Private Secretary to John Healey.^[16]

At the 2017 election, Matheson increased his majority from 93 to 9,176, turning Chester from a super-marginal seat into a safe seat.^[17] In the 2019 election, Matheson held onto his seat for a second successive election, by a majority of 6,164.^[18]

Resignation from Parliament

On 21 October 2022, The Independent Expert Panel recommended that Matheson be suspended from the House of Commons for four weeks over allegations of "serious sexual misconduct" towards a junior member of staff.^[19][20][21] He would have faced a recall from Parliament under the Recall of MPs Act 2015, but he announced his resignation shortly after news of the findings were made public.^[22][23][3] Matheson continued to deny any sexual misconduct but said he felt obliged to resign for health and family reasons.^[24] Following the findings, the Labour Party suspended his membership and withdrew the parliamentary whip.^[25]

His resignation was effected later that day following his appointment to the Chiltern Hundreds.^[26] He was succeeded by Labour candidate Samantha Dixon at the December 2022 by-election.^[27]