But who would kill the mother of two? Linda says she's grasping at straws to find answers.
47-year-old Joanne Valentine was a 'firecracker' according to her sisters.
"Joanne was a very hard worker, a very loving mother, a wonderful wife and unfortunately for my brother-in-law Vinny, his life ended in that driveway when JoAnne passed," Linda said.
Finding Joanne's killer was a family mission.
ABC2 News spoke to Joanne's other sister, Pam, several years ago about Joanne's murder.
"You thought you were outside yourself watching television because these kind of shows are on TV all the time. They just are. People get killed and it's all real dramatic and it happens at their home and you're looking at it and you're saying 'Oh my God this is really us," Pam Bustard said.
The moments leading up to Joanne's death are the biggest mystery.
She owned a bar -- Rumbefish -- in Pasadena.
She was on her way home from the bar and pulled in to her driveway.
"She was conversing with someone. Was she conversing with someone that she knew? Or was she conversing with someone she recognized? Or was she conversing with a total stranger like what are you doing on my property," Pam asked.
According to police, a small car may have pulled up behind Valentine. There was an argument and then Joanne was shot.
The shooter ran away into the night -- leaving Joanne dying in her driveway.
Linda has spent countless hours combing over who pulled the trigger and why.
She says she still isn't sure and is having a tough time as the years go on.
Sadly Pam passed away, leaving this Maryland Mystery in the hands of Linda, who's hoping someone comes forward to help.