Nuevo Laredo, Mexico - A US-based environmental group attempted to give a couple a special wedding on the Rio Grande earlier this month, but there was one small detail the groom failed to mention.

On April 11th, Mexican-born Ruben Alfonso Fierro, 27, and his fiancee, American Stephanie Guerro, 26, met on the river separating their two countries of origin. Abiding by US immigration laws, the couple took advantage of the 1848 treaty which, according to TIME, allows the freedom of navigation on both sides on Rio Grande. A judge from Laredo, Texas officiated over the wedding as the couple floated on a raft moving from Nuevo Laredo, Mexico to the US side of the border.

Guerro and Fierro have four children together, but with Fierro not legally allowed to be in the US the couple have been separated.

While this touching story appeared to be the start of positive immigration proceedings and a reunion of a happy family, there was one little detail Alfonso Fierro failed to mention. He was already married.

Mexican reporters reportedly found the estranged wife, Lizeth Anabely of Monterrey, who says it has been years since she last saw her husband. She also said it came as quite a shock to see her husband marrying another woman on television.

Fierro and Guerro’s marriage has since been annulled and the environmental group that help fund the wedding, the Big River Foundation, has vowed to bring another wedding to the Rio Grande in the hopes of drawing attention to the river, which they refered to as an "underutilized resource."