The names Martin, Krystle, Sean, and Lingzi were written on his bib as he ran today.
China's one-child policy has created tens of thousands of parents who have lost their only child. A growing population of "shidu" parents meet one another online to find solace and demand better state welfare.
Lu Lingzi's death in Boston reopened the battles over media transparency, the one-child policy, and China's vast community of bereaved parents.
"She died in America, and that's why we know her name." Friends and family use Chinese social media to try and find the third victim of the Boston bombings, and then to mourn her.
Her death was confirmed this morning by her father and Chinese state media. Lu Lingzi was killed on Monday along with Martin Richard, 8, and Krystle Campbell, 29.