This is a horrible tragedy. Turns out that Mr. Graniel ran afoul of a local gangster by the name of Christian Espat, and Dr. Swank was "collateral damage". A "young woman", who was "close to Mr. Graniel", has been taken in to custody.
https://edition.channel5belize.com/archives/187141
This morning, a wanted poster for twenty-three-year-old Christian Espat, a well-known person to police and alleged gangster on San Pedro Town, began circulating on social media. Espat was reportedly wanted for questioning for the double murder of tour guide Mario Graniel and prominent US doctor Gary Swank. On Wednesday, several persons including a woman were detained for questioning. Both men were killed on Sunday morning while fly fishing a mile west of San Pedro Town. Investigators believe that Doctor. Swank was a victim of circumstances while Graniel is said to have been the target. Prior to his murder, a lone gunman targeted Graniel at his apartment in the Boca del Rio area, however, Graniel failed to report the matter to the police. According to Commissioner of Police, Chester Williams, Graniel had a misunderstanding with a notorious gang figure in San Pedro town. And while police continue their investigations, Espat has taken to social media to not only deny accusations of his alleged involvement in the double murder, but also proclaimed his innocence. Espat recorded a one minute video in which he says that he will hand himself over to San Pedro police because he has absolutely no involvement in the murder of Mario Graniel and Doctor Gary Swank.