The mother of Chicago police Officer Krystal Rivera filed a wrongful death lawsuit Wednesday in which she says her daughter’s partner, Officer Carlos Baker, was struggling to accept her decision to end their romantic relationship when he fatally shot her during a foot chase on June 5.

The lawsuit, filed in Cook County court against Baker and the Chicago Police Department, says the breakup stemmed from Baker’s infidelity and that Rivera had threatened to tell his live-in girlfriend about their relationship.

It says Baker showed up uninvited at Rivera’s home a day before the Gresham District tactical officers chased a gunman into an apartment in Chatham and encountered a second armed man, leading Baker to fire a single gunshot, which pierced Rivera’s back, killing her.

Baker then “ran in

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