Landry said the relationship was tumultuous from the start.
"We, as parents, noticed all kinds of red flags and we did everything we could to make that relationship no more and of course, that didn't go over too well," Landry said.
Break the Cycle, an agency devoted to empowering youth to end domestic violence, says that seven other states, a majority of which are in the south, also do not include dating relationships in their definition of domestic violence, often preventing the youngest victims of relationship abuse from applying for any type of restraining order.
"That excludes a huge amount of relationships - especially for young people," Cristina Escobar, a spokesperson for Break the Cycle, told Crimesider.
"Right now, we don't really have any teen dating violence laws [in South Carolina]," she said.
Tanner Crolley is charged with murder in the death of Sierra Landry and is being held without bail.
Join our growing singles community in South Carolina and Get Connected with free mail, forums, blogs, IM, and chat.WATCH: 48 Hours: "Loved to Death" In South Carolina, an order of protection - which is stronger than a restraining order and imposes greater restrictions - cannot legally be obtained by a person who is only in a dating relationship.The state only allows protection orders against someone of the opposite sex to whom you are either married, have lived with, or have a child with - and who has physically or sexually abused you.Sierra Landry was a 16-year-old cheerleader with good grades and aspirations of becoming a model when she began dating a schoolmate who would eventually end up harassing, beating and ultimately killing her, Sierra's stepmother, Jessica Landry, told CBS News' Crimesider.But Sierra's death might have been prevented, says her stepmother, if Sierra had been able to get an order of protection against her ex-boyfriend - something the Landrys' home state of South Carolina prohibits.