By Laila Kearney SAN FRANCISCO (Reuters) - A software engineer died over the weekend after jumping off a popular mountaintop in Northern California's scenic wine country wearing a "speed parachute" and veering into a rock formation, authorities said on Monday. Walden Grindle, 35, survived the impact of colliding with a cliff off of Mt. Saint Helena, a 4,340-foot (1,323-meter) peak in Napa County, long enough to make a cell phone call and activate an emergency response tracker before succumbing to his injuries, Napa County Sheriff's Captain Leroy Anderson said. ...

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