Anti-Violence Advocate Charged with Murder at Child's Birthday Party

Former MMA fighter Lumumba Sayers Sr. allegedly shot Malcolm Watson in possible retaliation for his own son's death.

Sayers Sr. is accused of shooting Watson in the head at a Commerce City, Colorado park.
The incident is believed to be connected to the murder of Sayers Sr.'s son a year earlier.
Witnesses claim Sayers Sr. tried to shoot Watson again and plant a gun on him.
Sayers Sr. has a history of anti-violence activism and community work.
Watson's family denies his involvement in the previous killing of Sayers Jr.