Coroner Joseph Campbell says Daniel had been driven to the center in Penndel by a neighbor who operates it.
Campbell says Rimma Shvartsman forgot about Daniel and returned in the late afternoon to find him unresponsive.
Campbell has ruled the boy's death because of an elevated body temperature an accident.
District Attorney Michelle Henry says no charges have been filed and an investigation continues.
Shvartsman's lawyer, Michael Mustokoff, says the boy's death is a "tragic accident" and his client is cooperating with the investigation.
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