George Chen on Halloween night, 2013, his freshman year at the University of California, Santa Barbara.

Chen was one of six victims in a murder spree in college town of Isla Vista, near UCSB, on May 23, 2014. The grieving parents of Chen and two other victims - David Wang and James Hong - shared memories of their sons with CBS News.

"He always tried to put up his big smile everywhere," Kelly Wang, right, said of her son, George Chen, pictured on a cruise to Mexico while he was in high school.

George Chen poses with his dad Johnny Chen while on a cruise in high school.

"If you see those pictures, you can see how close we are," said Jane Liu, of her son, David Wang. "Each time he would hold my shoulders, hold my hand. He was very very sweet."

Charlie Wang and Jane Lui stand with their son, David.

James Hong and David Wang pose for a photo in September 2013, after moving into their Santa Barbara apartment.

James Hong is seen teaching iOS program development at a computer company in Taiwan and China.

James Hong attends his brother's university commencement in mid-May, 2013, just days before his tragic murder.