Authorities say Lynn Jackenheimer, 33, of Ashland, went to Hatteras Island on the Outer Banks last week with her on-and-off boyfriend, Nate Summerfield, and her 13-year-old daughter and their 3-year-old son but didn't return with them.
Summerfield's brother called police to tell them that Summerfield told him he strangled Jackenheimer.
According to CBS News, Jackenheimer had been hesitant about taking the trip, and Summerfield has a prior domestic violence conviction involving her.
She has been missing since July 4.
Her sister told WEWS-TV in Cleveland that the family wanted to help police resume the search Thursday.
Police also are looking for Summerfield, who is described as a person of interest.
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