On Memorial Day, May 29, 2006, 17-year-old Julio Diaz-Guillen was shot and killed during a birthday picnic at South Shore Park in Milwaukee, Wisconsin. Julio had spent the morning at a new yard-work job and arrived at the park around 6 p.m. with two friends and his uncle to join the gathering. The celebration was interrupted when Octaviano Juarez-Corro, who was identified as the estranged husband of one of those present, arrived uninvited and opened fire on the crowd.

Julio was struck once in the back of the head and once in the back and was pronounced dead at the scene at 8:31 p.m. Raymundo Munoz, a friend from work who was also at the picnic, was killed in the attack; three other people, including Eunice Torrez, were wounded. Juarez-Corro fled the scene and remained at large for many years before being arrested in Zapopan, Jalisco, Mexico, on February 3, 2022.

If anyone was at South Shore Park that night or has information about the shooting, please come forward to help the families remember Julio and Raymundo.