MEMPHIS, Tenn. (WMC) - This Memorial Day weekend marks four years since the murder of 26-year-old Sergeant Calvin Wilhite.
Wilhite was shot and killed walking outside FedExForum on May 25, 2015.
Surveillance photos show the suspected gunman but so far, no one has been arrested.
Also, no one has come forward with information on the killing of "Young Coo,” as his loved ones called him.
The vigil was held at MLK and 4th Street in Downtown Memphis.
"Y'all, this is hard. This is difficult,” said Valerie Henderson, Wilhite’s mother.
An emotional Valerie Henderson on the fourth anniversary of her son's unsolved murder.
Family and friends offered encouragement at the vigil.
“Don't stop, keep going until we get answers,” said Stan Bell, family friend.
"We just came to support the family,” said Michael Rallings, Memphis police director.
Memphis police director Michael Rallings and his top brass are in constant contact with Henderson, trying to crack this case.
"A lot of times people don't think we know what it's like to grieve, but we know what it's like to grieve,” said Rallings.
Henderson holds a vigil every year to keep Coo's memory alive and his murder in the public eye.
Her car, the license plate, flag and decals honor Wilhite.
A $20,000 reward has been offered for his killer.
"So I have joy. I didn't have joy three years ago, but I have joy,” said Henderson.
A top forensic expert analyzed the video identifying the make and model of the shooter's car.
"We're hoping for a victory soon feels like one is getting ready to come and that's why I have a joy in my heart now,” said Henderson.
Loved ones, including Wilhite's eight-year-old daughter Neveah, formed hashtag J4C.
With a drone overhead and candles lit, they went all out this year.
"Yes, yes we did. Justice for Coo,” said Henderson.
If you have any information about the shooting, call Crime Stoppers at 901-528-2274.