"We just want to find out what happened to our loved ones," Joyce Call-Canada told AOL News. "It's very difficult not knowing where your family member's remains are."
Call-Canada is the sister of Richard "Keith" Call, who along with Cassandra Hailey was among eight people slain along a scenic 23-mile route between Jamestown and Yorktown, Va., from 1986 to 1989. The case has attracted renewed attention from investigators in recent months.
Call-Canada's 20-year-old brother was on his first date with Hailey, 18, when the couple disappeared mysteriously on April 9, 1988. Call's car was later found abandoned at the York River Overlook on the Colonial Parkway. The door was wide open and the keys were in the car. Authorities found Call's wallet, glasses and watch in the car, along with Hailey's purse, bra and just one of her shoes.
Multiple searches were conducted for the couple, but no other trace of them has ever been found.
Call and Hailey's case shares similarities to the deaths of six others, leading law enforcement officials to view their disappearances as the work of a possible serial killer.
According to Call-Canada, the new search, being conducted with guidance from the FBI, is scheduled for June 5 in Yorktown. It will encompass a three-mile radius around the area where Call's vehicle was located.
"The response has been overwhelming as far as people volunteering," Call-Canada said. "I have had ex-Navy officers, firefighters, childhood friends, etc., offering to volunteer. It is just amazing how many people care and want to help."
Jennifer Phelps, one of the individuals helping coordinate the search, has a personal interest in the case -- her sister-in-law, Annamaria Phelps, was one of the last two victims of the unknown serial killer.
"We need closure in this case, and we're hoping we might find some clue that helps find their loved ones and possibly leads to the person who is responsible," Phelps told AOL News.
Annamaria Phelps, 18, and a friend of Phelps' boyfriend, 21-year-old Daniel Lauer, went missing over Labor Day weekend in 1989. Lauer's car was later found parked at a rest area on the westbound side of I-64.
The case fits a pattern that investigators had encountered before: Lauer's keys were found in the ignition, and items of clothing belonging to both of them were found inside the car. Annamaria's purse was left untouched.
Several searches were conducted but failed to uncover any signs of the young couple. Then, in October 1989, a hunter stumbled upon the couple's skeletal remains less than a mile from the rest area where Lauer's car had been found. They were found side by side.
In addition to volunteer searchers, Jennifer Phelps says cadaver dogs from Powhatan County, along with private investigator Steve Spingola from Milwaukee and his associate, Mike Grogan, will assist in the search.
"Steve is going to go over our cases and do his own investigation," Phelps said. "He is also going to help us with the search."
Spingola, a 2001 graduate of the FBI National Academy, holds two master's degrees and is a death investigations expert, is a police-related shooting reconstruction specialist and has formal training in criminal profiling.
"I have talked with the FBI, and we are going to see if we can meet with law enforcement officers to see what direction the investigation is going," Spingola told AOL News. "We are also going to call Texas EquuSearch [a missing-person search and recovery group] to see if they can give us help."
Spingola said that while there is no guarantee the bodies will be found, it is not out of the realm of possibility that they will be.
"These types of individuals are lazy people," Spingola said. "When you look at the other cases, you'll notice the killer would take them out in the woods, kill them and leave them there. So, it's unlikely he [changed his M.O. and] dug a hole for these two."
Spingola's role in the case has also brought hope to the families of the remaining Colonial Parkway victims.
Bill Thomas, whose sister Cathleen Marian Thomas was one of the first victims, says he is eager to have a fresh set of eyes looking at the case.
"[The] families are thrilled to have Spingola and his associate ... visit Virginia to look into the still-unsolved murders," Thomas said. "We thank both gentlemen for volunteering their time."
Meanwhile, Call-Canada and Phelps are asking anyone interested in signing up as a volunteer for the search on June 5 to e-mail FindKeithandCassandra@gmail.com.
"We have dozens of volunteers right now, along with some search and rescue groups, but we are hoping that number will continue to grow," Phelps said. "There is a lot of ground to cover in a short period of time, so the more people we can get out there, the quicker we can get it done."