Gary Paul Swank, 53, a cardiologist at Carilion Clinic, who was recently promoted to associate professor at the Virginia Tech Carilion School of Medicine, was on vacation with his wife and school-age children when he was killed on Sunday, according to NBC affiliate WSLS.

Swank and popular local tour guide Mario Nestle Graniel Jr., also 53, went fly fishing in the San Pedro Town lagoon around 10 a.m. when a dark skiff passed by and someone opened fire on their small boat, local authorities told the San Pedro Sun.

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