Hayes died while at his caregiver's home. I don't know if his death is associated with that. He was also on his tummy while taking a nap. I don't know about that either. SIDS is a category for when we don't know why they died. There is no known cause. Teh good news is that research is being conducted.
Investigators in Germany noted have several risk factors for SIDS, one of which is sleeping away from home. You can read the article here.
"This study in general," the investigators conclude, "supports the current recommendations of the American Academy of Pediatrics," which call for parents put infants to sleep on their backs as opposed to their stomachs.