CHICAGO (CBS)—Four months have passed since a 25-year-old Northwestern graduate student Shane Colombo was fatally shot just hours after moving to Chicago.

Colombo was shot to death in the 7500 block of North Clark Street, in the Rogers Park neighborhood, in September.

Shane Colombo, 25, was shot and killed on Sept. 3, 2018. (Photo supplied to CBS)

He had been living in Chicago for only six hours after moving from California, when he left his house to run an errand and was caught in crossfire.

Police said Colombo was not the intended target. He was taken to St. Francis Hospital where he later died, authorities said.

His mother, Tonya Colombo, announced that an anonymous donor increased the reward money from $10,000 to $12,000 for a tip leading to an arrest in the death of her son.

She describes him as a “beautiful and bright light.”

“Whatever we have to do to get the individuals who are responsible for taking my son’s life caught, we are planning to do,” Colombo said.

Community leader Andrew Holmes encouraged someone to come forward with information about the night Colombo was shot.

“As you look at the TV and you see your son, your nephew, your brother running from this crime scene after discharging a weapon, do the right thing and turn these individuals in,” Holmes said.

Colombo said she’s been touched by the outpouring of support she’s received since her son’s murder.

“I’ve been contacted from people all over the United States who want to help in some way,” she said.

Police surveillance photos released last fall show three men wanted in connection with the shooting.

Read more: 

Northwestern Grad Student Caught In Crossfire, Fatally Shot

Police Release Images Of 3 Suspects In Slaying Of Northwestern Student Shane Colombo

$10,000 Reward For Information On Killer Of Northwestern Student