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Crime writer Michelle McNamara, the wife of comedian Patton Oswalt, died on Thursday at the age of 46, Oswalt’s publicist confirmed on Saturday.

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She died in her sleep, the publicist told the Associated Press. No cause of death has been reported.

McNamara created the True Crime Diary, a blog devoted to both breaking crime and cold cases.  Some of the lesser-known cases she covered included the Golden State Killer and the 1976 murder of Melanie Howell, according to the AP.

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McNamara was a graduate of the University of Notre Dame, and received a master’s degree in creative writing from the University of Minnesota.

McNamara and Oswalt married in 2005. They have a seven-year-old daughter, Alice.

Oswalt’s comedy special, Talking for Clapping, taped six months ago in San Francisco, premiered on Friday. Oswalt, normally a prolific tweeter on politics and other news events, simply retweeted the Hollywood Reporter article about his wife’s death.