'Somebody, somewhere knows something': Family of college student gunned down in unsolved case ups reward to $12,500 in desperate plea to catch killer

Rebecca Foley, 21, shot dead in her Volkswagen Beetle four months ago



Parents believe she is victim of mistaken identity or robbery gone wrong

Father adds $10k to reward saying: 'I don't want it to become a cold case'



Had a bright future: Rebecca Foley was shot dead outside her home in Savannah, Georgia, four months ago

The parents of a Georgia college student gunned down outside her home four months ago have raised the reward money to $12,500 in a desperate plea to catch her killer.

Rebecca Foley, 21, was shot dead in her Volkswagen Beetle as she drove up to her condo development in Savannah on January 21.

She was found slumped over her steering wheel after being hit with a single bullet that left a hole in her rear window.

Her family thought she must have been the victim of mistaken identity or a robbery gone wrong and believed a witness or suspect would soon emerge.

But despite high-profile media coverage, there has been no breakthrough in the case.

Rebecca's father, Eddie Foley, has now added $10,000 to the previous $2,500 reward for information that leads to an arrest and conviction.

He spent two days last weekend putting up fliers around the city appealing for help.

'Somebody, somewhere knows something,' he told NBC News .

'I don't want it to become a cold case and I feel like that's what it's becoming.'

Rebecca has been described as a pretty young woman with a bright future who held down several jobs to put herself through college. She had hoped to go into the insurance industry.

Crime scene: Rebecca was shot dead in her Volkswagen Beetle as she drove up to her condo development in Savannah on January 21

No leads: Her family thought Rebecca must have been the victim of mistaken identity or a robbery gone wrong and believed that a witness or suspect would soon emerge

Her mother, Jennifer, has joined a bereavement group and is seeing a therapist to help her through the grief and uncertainty of the past few months.

She had considered hiring a private investigator, but decided against it.

'There's no closure,' she said. 'I feel this incredible, overwhelming sense of helplessness. It feels like nobody cares.'