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On the night that Jennifer Dulos was reported missing from affluent New Canaan, Conn., the police found blood stains and spatters at her home that would lead them to conclude she had been the victim of a serious physical assault, according to arrest warrants released Monday.

The police later discovered through cellphone records that on that same night, May 24, Ms. Dulos’s estranged husband and his girlfriend had driven to Hartford, where surveillance cameras had recorded them tossing bags and other items into trash cans as they drove through the city, the warrants said.