Oda announced in early July that she would step down effective today, but didn't reveal what sparked the decision.
She faced controversy over her spending while travelling and the altering of a CIDA funding document.
Specifically, Oda was forced to apologize for ordering a $16 glass of orange juice at a swanky London hotel, an expense she later repaid, among others.
Oda has issued an open letter to her constituents, thanking them for their support.
The letter, released Monday, offers best wishes for whomever is elected to replace her, although a byelection in her southern Ontario riding has yet to be called.
And she recalls the pride and pleasure she took from being involved in everything from local events to international affairs.
Since her first election victory in 2004, Oda has served as Canadian Heritage critic while in opposition, and then as heritage minister and most recently as the minister for international co-operation.
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