A search of his home, said Robert Wainwright, an assistant district attorney, turned up a will that Mr. Carriker had written, dated June 23. Mr. Wainwright did not say what was in the will. Mr. Wainwright said at least one of the seven people who shared a house with Mr. Carriker had recognized that he was becoming more disturbed. But officials encouraged people to report troubling behavior anyway, suggesting that Mr. Carriker might have gotten help had the authorities known of his behavior. After a 2004 misdemeanor conviction for carrying a gun without a license, Mr. Carriker had apparently spent his life largely off the radar of local law enforcement.

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Persons: Carriker, Robert Wainwright, Wainwright, Carriker’s, Joanne Pescatore Organizations: Prosecutors Locations: Pennsylvania