SOUTH PHILADELPHIA (WPVI) -- Nary Ly describes her father, Don, as a hardworking man and a fixture on Penn's campus where he sold produce from his fruit cart every day."He never stopped working," said Ly.The morning of April 18, 2013, started like any other. At about 5 a.m., the 68-year-old was loading up his cart in front of his home in the 400 block of Vollmer Street in South Philadelphia.That's when police say a man approached and stabbed him multiple times, killing him.Ly's family doesn't believe this was a robbery since their father's wallet was still on him with about $200 in cash inside."I want to get this person off the streets," said Ly. "I don't want anyone to be a victim like my dad."Police have released surveillance video of the suspect.He's described as a light-skinned black or Hispanic male, 5 foot 8 inches tall, with facial hair and a thin build.He was seen wearing dark colored clothing, a dark knit hat and black Chuck Taylor Converse sneakers.The Citizens Crime Commission is administering a $5,000 reward, and the City of Philadelphia is posting up to $20,000 for anyone with information that leads to the arrest and conviction of the person responsible.Anonymous calls can be submitted by calling 215-546-TIPS.