As the mystery around Teena Marie’s sudden death unravels, it appears a seizure may have played a role in the singer’s passing.

The late R&B vet was found dead in her home by her daughter the day after Christmas. TMZ reports that Marie might have suffered a grand mal seizure while taking a nap on Sunday afternoon. Marie’s daughter reportedly checked in on her at 1 p.m. and she was fine. However, when her daughter checked in on her at 3 p.m., Marie was unresponsive. Marie also sustained a grand mal seizure last month and had insisted on having someone nearby when she went to sleep.

Illegal drugs appear to have been ruled out as a culprit as well. According to TMZ, law enforcement officials failed to find any illegal drugs that may have contributed to the songstress’ unexpected death.