The Sullivans are not the only ones looking for answers. That's why one national organization continues to work closely with people who are missing loved ones.
"I want to find my son, bring my son home, as well as I want the Sullivans to find their son, and the rest of the family members to find their kids," said Ray Bradley, Johnny Bradley's father.
"I love you and I hope you are alright. Please come home," said Sandra Poole, Sharon Shechter's mother.
Ray Bradley and Sandra Poole both have children who are missing. Both attended Sunday's butterfly launch to show their support.
"When you got someone you can put your arms around, and they are feeling what you are feeling, it makes life much easier," said Bradley.
Bradley's son went missing in May 2005. Poole's daughter went missing in December 2001. Years later, they remain hopeful thanks to organizations like the CUE Center for Missing Persons.
"These families we talk to on a daily basis. They are texting us, they are calling us, they are real people to us, they aren't just a case number," said Monica Caison, Executive Director and Founder of the CUE Center for Missing Persons.
The CUE Center is a non-profit organization based out of North Carolina. Caison says the organization provides national services for families of the missing. Resources for search and recovery are free.
"The CUE Center is a big avenue, bigger than what we are, because we are only regional. They are national, so with their help, they have more tools and avenues that they can use than we can," said Bradley.
Along with promotional and awareness campaigns, the CUE Center develops relationships with local law enforcement. Together, they come up with a plan to help solve each specific case.
Investigator Sgt. Scott Walsh says leads constantly come into the Monroe County Sheriff's Office.
"We work hard, we constantly review them, we have monthly and annual reviews of our cold cases, so we are very in tuned with what the cases are," said Walsh.
Sunday's butterfly release in honor of Brian Sullivan is a way for familes to come together and remember their loved ones as they search for answers.
"Some days it can be a little overwhelming, but the bottom line is, we have to work together and we have to bring the families together because they are each other's support system," said Caison.
Some of these unsolved cases happened more than a decade ago, but families remain hopeful. Caison says in her experience, every community holds clues.
Many families with missing loved ones were at Sunday's butterfly launch. To learn more about their stories, and how you can help, go to http://www.ncmissingpersons.org/.