ABC News reports that Michelle McNamara, wife of comedian Patton Oswalt, died in her sleep Thursday night, according to his publicist. At this time, no cause of death is known. She was 46 years old.

Though her husband is better known, McNamara was acclaimed in her own right, known for her writing and for founding the website True Crime Diary, which covered breaking stories and cold cases.

Her passing tragically comes the day her husband's latest comedy special was due to hit Netflix.

Along with her husband, McNamara is survived by her 7-year old daughter, Alice.