Mullin left parliament in 2010 after 23 years as an MP and three ministerial jobs.
In November 2013 he announced his intention to stand down as an MP at the 2015 general election.
His solicitor said he did not intend to quit as deputy speaker or as an MP.
Mr Wicks, who was 65, had served the north of Croydon as an MP since 1992.
The Independent said Jamie Oliver was going to stand as an MP for the Conservative Party.
The Labour Party has made it clear that she should never stand again as an MP.
"As an MP, I say she should be the prime minister, " Rahul Gandhi told Indian television.
Mrs Robinson is stepping down as an MP and MLA. She is also leaving the DUP.
BBC: Woodward warns Robinson crisis must not derail assembly
Ms Mensch resigned as an MP, having represented Corby since 2010, to move to New York.
Later still, as an MP, I realised to my shock that this wasn't confined to inner-city London.
BBC: NEWS | UK | Politics | Full text: Blair on law and order
Former journalist and MEP Mr Huhne, who was only elected as an MP in May, polled 10%.
He entered Parliament in June 1987, and said he had "incredible memories of my time as an MP".
The Eastleigh by-election was set in motion when Chris Huhne stepped down as an MP on 4 February.
BBC: Eastleigh by-election: Miliband restates 10p tax pledge
She has had the whip withdrawn for neglecting her duties as an MP.
Mr Evans's solicitor has already said the MP does not intend to quit as deputy speaker or as an MP.
She was elected as an MP in 2002 and served as a minister in the Kenyan government for a time.
He studied law in his home city, which he now represents as an MP, and pursued his studies in Paris.
In all my life as an MP I have had a main home in the constituency and a flat in London.
Huhne admitted the same charge last Monday and quit as an MP.
Mr Huhne, 58, quit as an MP after admitting perverting the course of justice over claims his ex-wife took speeding points for him.
Mr MacShane is standing down as an MP after a committee recommended a year's suspension from the Commons for claiming money using fake receipts.
BBC: Police right to revisit MacShane case, says Yvette Cooper
Yet unlike Jordaan, who has clearly retained the political skills that saw him serve as an MP in the 1990s, Khoza had no back-up option.
The by-election was called after Huhne resigned as an MP following his admission he had perverted the course of justice over the driving licence points.
It's something I happen to believe in myself and I've always voted for as an MP and you will see the proposals in due course.
The Labour politician, who is survived by his wife, son and daughter, was born in Dundee and served as an MP in Glasgow for 29 years.
BBC: Former Scottish Secretary Bruce Millan's funeral is held
Mr Gibson said he had been proud to serve as an MP since 1997 but following the NEC's decision, he believed his position had become "untenable".
When his father died, he was persuaded to leave his practice as a land economist to take up his father's seat as an MP in western Kenya.
Huhne did not admit to the offence in the calls but on Monday he pleaded guilty to perverting the course of justice and resigned as an MP.
BBC: Vicky Pryce-Chris Huhne phone call transcripts released
And David Davis, then shadow home secretary, resigned from the shadow cabinet and as an MP to provoke a by-election as a referendum of 42-day detention legislation.
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