By DOMINGO RAMIREZ JR. A lake outing for a Dallas family turned tragic Saturday when a 41-year-old man drowned at Lewisville Lake, a fire official said Sunday.The victim was identified as Gustavo Terrones of Dallas who was pronounced dead shortly after 6 p.m. Saturday at a Lewisville hospital, according to the Tarrant County medical examiner's office on Sunday.Terrones' death was ruled an accident, the medical examiner's office determined.The incident happened shortly after 5 p.m.