Lawyers for Karen Read have asked a federal judge to prevent her retrial on two charges related to the death of her Boston police officer boyfriend.

Karen Read has taken her double-jeopardy challenge to toss the murder charge against her to federal court on the same day a lower-court judge said she has “grave concern” about the sensational case.

The judge overseeing Karen Read’s second murder trial abruptly suspended a court hearing Tuesday after saying allegations ...