While police have identified the four on the scene at the time, no one has been charged.
Meanwhile, a family friend has stepped up to help raise funds for Lamont, his wife and their daughters.
Craig Mullins has begun raising money through GoFundMe, a crowd-sourcing website where people can donate to projects or causes. So far, the total for the Lamont family has topped $3,000, with a total goal of $20,000.
"David is the only income for the family." Mullins said. "While he's gone, the business basically tanked. There's no money coming in."
"I just thought they need some cash, so I figured that would help them out a little bit, at least get them through a couple of months," he added.
Lamont, 51, is the father of two teenage girls, one in college and one a freshman at Foothill High School. His wife, Agnes, has spent much of the time since the attack at his side.
"She wants to spend all her time at the hospital by his bedside," Mullins said.
He said Lamont has been moved to a rehab center following a lengthy stay at Eden Medical Center in Castro Valley. But Mullins said his friend faces a long period of rehabilitation, learning to talk and walk again.
To donate money to the family, go to GoFundMe.com and search for David Lamont's name. A donate button is near the bottom of the page.
"Click on that link and give a dollar, give $5, whatever you can afford," Mullins said. "I figure that will get them by for a little bit of time, hopefully by then, she (Agnes) can have something cooking."
Lamont was left comatose after the attack. Pleasanton police have what they described "credible leads" and have interviewed what police Sgt. Maria Munayer said at the time were "several involved parties who are currently persons of interest."
The investigation narrowed down to "people who are high school age," Munayer said. The department has witnesses, but Munayer did not comment on whether they were passengers in an SUV spotted leaving the scene, or if the focus had been narrowed down to one high school in particular.
Munayer said police hope that Lamont will be able to provide a statement. Given his current condition, it's unknown how long that will be, and until then, the case is on hold.