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Although the California connections run deep throughout the sprawling college admissions scandal, the complex federal case is now playing out in Boston.

My colleague, Kate Taylor, has been covering the court proceedings. Here, she reports on the latest:

In a coup for prosecutors and possible bad news for other defendants in the sweeping college admissions fraud investigation, one of the parents charged in the case, Davina Isackson of Hillsborough, Calif., has agreed to plead guilty and to cooperate with the government, according to a person with knowledge of the case.

Two other parents have said so far that they intend to plead guilty, and more will probably follow in the coming days. But Ms. Isackson’s agreement to cooperate is significant. Ms. Isackson and her husband, Bruce, a real estate developer, were accused of conspiring with William Singer, the college consultant at the center of the case, to bribe athletics officials in order to secure their daughters’ admission to U.C.L.A. and U.S.C. as athletic recruits.

Prosecutors also accused them of paying Mr. Singer so that a proctor could correct their younger daughter’s answers on her ACT exam. The prosecutors have said that the Isacksons paid Mr. Singer a total of $600,000.