Six years have passed since someone brutally killed Terry and Darleen Anderson of Mongo.

The couple's murder marked LaGrange County's first ever double homicide.

On the sixth anniversary of a date that they cannot forget, family and friends of Darleen and Terry Anderson gathered to ensure others would not either.

Terry’s daughter, Sherry Musilek, spoke during the memorial. She says, "My father and stepmother cannot speak for themselves, so I must be their voices. I must be the person who speaks on their behalf, crying out for justice for as long as it takes."

Police say around 8:00 p.m. on the night of October 20th, 2005, someone viciously attacked the couple in a way few can fathom.

Despite a $20,000 reward and an appearance on the television show America's Most Wanted, there has never been a conviction, let alone an arrest.

"So here I stand, next to the graves of my beloved father and stepmother for the sixth time, asking and pleading for help in solving their murders and remembering their lives."

Hoping there will not be the need for a seventh memorial, black and red balloons were released into the afternoon sky, a symbol for victims of murder and the loved ones that are left behind.

"The horrible deaths of Terry and Darleen Anderson have not been forgotten. Unfortunately, my son will never know his grandparents. Please don't let him grow up, never knowing who killed them."

Family members say an elite forensic investigation society, responsible for solving dozens of cold cases, has agreed to take on the Anderson murders.

However, for reasons unknown, the LaGrange County Sheriff's Department has refused to honor that request.