ZEPHYRHILLS - The lake at Zephyr Park was like glass early Monday evening as 63-year-old Nancy Booth and her two adult children sat at a picnic table beneath a great oak tree. No rain, no wind, mostly clear. Then, witnesses heard a horrible crack. The oak at the water's edge was splitting. Booth's children scampered out of the way, but one of the huge falling limbs pinned their mother to bench where she sat. Booth's daughter, Caloie, ran to a passing van yelling for help. The driver, 39-year-old Gary Killeen, having seen the tree fall, jumped out of the van...