AP) — Family members of a 16-year-old northeast Kansas student killed in Costa Rica in 2011 are hoping for a second round of justice in the teen’s death.

McLouth High School student Justin Johnston was in Costa Rica with other McLouth students and sponsors on a nine-day trip to the Central American nation. Johnston was shot by a security guard who mistook him for a thief.

A tribunal in Costa Rica convicted the security guard and sentenced him to 15 years in prison for shooting Justin. But an appellate court ordered a new trial, ruling that the trial judges hadn’t established their finding that the guard had fired the gun with intent to kill.

Justin’s family is attending the new trial, which begins this week.