OTTAWA - Embattled former cabinet minister Bev Oda is saying her final farewells, but isn't offering any explanations for her decision to resign.

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.