Julie Hamp resigned last week three months after her appointment as Toyota's first female managing officer (Reuters/Kyodo)

TOKYO (Reuters) - Tokyo prosecutors plan to release former Toyota Motor Corp executive Julie Hamp from custody after she was arrested last month on suspicion of illegally importing the painkiller oxycodone into Japan, Kyodo News reported on Tuesday.

Kyodo said Hamp, who resigned last week just three months after her appointment as Toyota's first female managing officer, is set to be released without indictment on Wednesday, the latest she can be held without a formal charge.

A spokeswoman for the Tokyo District Public Prosecutors Office declined to comment on the report.

"We have not announced anything (on Hamp)," she said.