Brendan Horan says he will not challenge the NZ First board's decision to expel him from the party after claims he improperly accessed his dying mother's bank account.
Last night, the NZ First board said Mr Horan "by his own action in notifying the Speaker that he be regarded as an independent member of Parliament" had "relinquished his membership" of the party.
That decision came after Mr Horan said he had used his parliamentary mobile phone 144 times while an MP to place bets with the TAB at a total cost to the taxpayer of about $20.
Prime Minister John Key defended that use as within the rules for MPs.
Mr Horan's cellphone records showing calls to the TAB were leaked to the media last week, a few days after he was expelled from the NZ First caucus following the allegations about misuse of his mother's money, and a gambling habit.
NZ First leader Winston Peters has said Mr Horan's use of his parliamentary cellphone to place bets was one of the reasons he sacked the MP.
Before the NZ First board announced its decision, Mr Horan said he still considered himself a member and would be disappointed if he was expelled.
"I would expect that they would call me for my version of events and I haven't been called so I'm not going to pre-empt their decision that may or may not be made."
However, he would not challenge any decision to expel him.
Mr Peters last night said Mr Horan ceased being a member of the party when he approached the Speaker, Lockwood Smith, last Wednesday about staying on as an independent MP.
"Under our constitution that's the end of it. It's a fait accompli achieved by his own request."
Mr Key said yesterday that an MP's personal use of a parliamentary mobile phone was not a reason to sack them.
"I use my mobile phone to ring my wife, I use my mobile phone to make restaurant bookings."
Mr Key said he understood that was permitted as a fringe benefit.
He also questioned whether the frequency of Mr Horan's calls to the TAB indicated he had a gambling problem.
"Ringing 14 times a month - is that an addiction? I reckon that would be a stretch."
However, Mr Horan is under fresh pressure in the form of media reports that forensic accountants examining his late mother's affairs have raised issues about a number of cheques.
He responded yesterday by swearing on a Bible provided by a reporter that he did not have a gambling problem and had never stolen money from his mother.
However, he did not deny receiving money from her.
"My relationship with my mother was such that if I ever required anything all I needed to do was ask", he told RadioLive's Duncan Garner.