By Heejin Kim

SEOUL (Reuters) -South Korea's former first lady, Kim Keon Hee, appeared in court for a five-hour hearing on Tuesday, but the judge has yet to issue a ruling on a prosecution request for a warrant to arrest her on accusations of graft.

If detained, she would be South Korea's only former first lady to be arrested, joining her husband, ex-President Yoon Suk Yeol, in jail as he faces trial, following his ouster in April, over a botched bid to impose martial law in December.

Kim, wearing a black suit, bowed as she arrived, but did not answer reporters' questions or make a statement. After the hearing ended she left to await the ruling at a detention centre in Seoul, the capital, in line with customary practice.

The charges against her, punishable by years in prison, range fro

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