Officials have arrested a 16-year-old boy in connection with the fatal shooting of a teenager whose body was discovered at a dog park. Police haven’t released a motive in St. Paul’s 17th homicide of the year. Officials on Monday identified the victim as Angel Gabriel Reyes Hernandez, of St. Paul. Officers were flagged down early Sunday by a person who said a body was lying in the parking lot of an area dog park. Officers located the victim, and paramedics pronounced him dead.