(CNN) - Missouri authorities have identified additional people killed in last weekend's tornado, bringing the toll of the United States' single deadliest twister ever recorded to 142 deaths, authorities said Saturday.
Among the dead was Will Norton, a recent high school graduate who attracted national attention when he disappeared during the storm.
The 18-year-old was driving home from his graduation Sunday when the tornado destroyed the Hummer H3 he and his father were in.
"Mark (Norton's father) said that he reached over and he grabbed Will with both of his arms ... he held on to him until he possibly couldn't anymore and so he's feeling really bad about that because as a dad you don't want to ever let go of your kids. You want to protect them forever. But at least we know that he did absolutely everything he possibly could," said Tracey Presslor, Norton's aunt, through tears.
Norton's body was found Friday by divers in a pond close to where his vehicle had been.
Related: Family searching for missing teen
Meanwhile, 100 persons remain unaccounted for, the Missouri Department of Public Safety said in a statement Saturday.
Deputy Director Andrea Spillars acknowledged earlier that families are frustrated that the identification process hasn't proceeded quickly enough the past week.FULL STORY
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