cnn's brynn gingrass has been all over this story.sten. >> he's laying on his bank, he's been extremely quiet, not really talkative to staff. >> accused serial killer rex heuermann alone and under suicide watch behind bars as the investigation into his alleged killings expands. >> i think in the coming days, as we continue to gather evidence anything is possible. >> his wife of more than 27 years now filing for divorce. in a statement her attorney said, the sensitive nature of her husbands arrest is taking an emotional toll on the immediate and extended family. >> if you ask me, i do not believe that the news about the double life that he was living -- >> a week after his arrest, the investigation spans three states, authorities are searching not only his long island home, but also his office, and nearby storage facilities. two las vegas condos he purchased, and in south carolina where he owns land. sources tell cnn that they are agents told his truck, which they say connects him to one of three murders he is charged for committing mo

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