The victim was riding in the park with a group of cyclists when he collapsed around 9 am Sunday.
His companions began CPR, and both paramedics, and a fire department flight medic lowered onto the trail attempted to resuscitate him from full cardiac arrest. However, he was pronounced dead at the scene after a prolonged effort to save his life.
This is the 13th bicycling fatality in Southern California this year, and the third in Orange County; two of those have been the result of natural causes.
My deepest sympathy and prayers for the victim and his loved ones.
And condolences to his companions who tried to save his life.