DETROIT — The former top aide and ex-lover of disgraced former Mayor Kwame Kilpatrick followed her old boss to jail Tuesday, the last step in a case that shook up Detroit politics for a year after romantic text messages between the pair made headlines.

Christine Beatty began a 120-day jail stay for obstruction of justice in Wayne County jail, where Kilpatrick has been serving an identical sentence since late October.

Beatty and Kilpatrick, both 38, were charged with lying about their affair under oath during a 2007 civil trial on claims that two police officers were punished for investigating alleged wrongdoing in the mayor’s inner circle.

— From wire reports