Tory MP Andrew Pelling has been suspended by the party following his arrest on suspicion of assaulting his wife.
A Conservative spokesman said the Whip had been suspended from the Croydon Central MP while the incident was investigated.
"Following a meeting with the Chief Whip, Andrew Pelling's case has been referred to the Conservative Party's Ethics and Integrity Committee," the spokesman said.
"Until a conclusion is reached, he has been suspended from the Conservative Party Whip."
Mr Pelling was arrested last Tuesday after his second wife, Lucy, made a complaint of assault. He has been released on police bail until October 1.
She has since told newspapers the marriage is "over", and she wants a divorce.
Mr Pelling, 48, was elected to Parliament at the 2005 general election with a narrow majority of 75, and is also a member of the London Assembly.
However, he has yet to be reselected for the seat and is expected to face difficulty winning the endorsement of local party members.
