FREDERICK, Md. (AP) -- According to police documents released today, anthrax mailing suspect Bruce Ivins behaved erratically in the weeks before the Army scientist took his own life.

The Frederick (Md) Police Department records also reveal that he told a nurse his Tylenol overdose was intentional.

The documents, first obtained by The Frederick News-Post, include details of an earlier overdose of drugs and alcohol.

Ivins, who worked in a biological defense laboratory, died at a Frederick hospital as federal authorities were preparing to charge him with mailing anthrax-filled letters that that killed five people and sickened 17 others in 2001.

The police records include a letter Diane Ivins wrote to her husband after he returned from a two-week stay in a psychiatric hospital. It accused him of being "rude and sarcastic and nasty."

Ivins apparently responded to the letter by writing on the back of the sheet: "I have a terrible headache. I'm going to take some Tylenol and sleep in tomorrow."