The child's teenage aunt was walking him through a crosswalk in his stroller when they were hit by the 72-year-old, who attempted to flee the scene.
And, even after the terrible tragedy made the athlete's son brain dead, the sports star toldCBS Los Angeles on Tuesday that he isn't harboring any hatred for the woman who took his baby's life, saying:
"I've always said, 'If someone takes from me, I take back.' And I'm really surprised actually that I don't feel any rage. I haven't felt any rage. I don't feel any hatred."
He also recalled the chilling moment his little one was struck, adding:
"There's footage showing [Liam's aunt] pressed the button for the crosswalk, but this lady didn't brake."
On Sunday, the fighter took Liam off life support. Marcus stayed at the hospital with his baby until Tuesday, when he finally said goodbye.
He posted this heart-wrenching picture to Instagram, as he held his son's hand for the last time: