Mark Anthony Barbosa was 25 when he was shot to death during the McKinney quadruple murder on March 12, 2004. The shooting occurred during a home invasion at the house of Rosa Barbosa, a 46-year-old check-cashing clerk who the attackers believed took cash home from work. After failing to find money, the intruders forced Rosa to give them the key and alarm code to her workplace; one of the men then shot Rosa.

Mark entered the home with two friends, Matt Self, 17, and Austin York, 18. The three were forced into a bedroom and shot by the burglars before the suspects fled. Mark, a carpenter and the son of Alejandro and Carole Barbosa Jr., was survived by his parents, brothers, and grandparents.

Investigators later developed DNA links tying Raul Cortez to evidence left at the scene, and Talisha Haithcox, the girlfriend of Eddie Williams, implicated Williams. Raul Cortez was convicted of capital murder and is on death row; Eddie Williams pleaded guilty and is in prison. The killings prompted community efforts to honor the victims through scholarships and other initiatives.

Did anyone who knew Mark or his circle in McKinney around 2004 see or hear anything that could shed more light on that night?