It was a tragic day at the park for the family in Edmond on Sunday.
Emergency crews told News 9 a 2-year-old girl collapsed at Mitch Park on Sunday afternoon. Paramedics say by the time they got there, the child was not breathing and was pronounced dead at the hospital.
Doctors have said they believe her death was caused by a "cardiac event" and the warm weather did not play a role.
Authorities did not identify the victim.