Prosecutors have charged a third man in connection to the death of Lisa Lopez-Galvan and injuries to more than two dozen others at the Kansas City Chiefs’ Super Bowl parade last month … with officials tracking down the suspect using surveillance footage, social media and cell phone data.

20-year-old Kansas City native Terry Young was charged with second-degree murder, unlawful use of a weapon and two counts of armed criminal action for his alleged role in the tragedy … after he was accused of pulling out a gun and firing several times during the shooting.

According to court docs, officials claim surveillance footage shows an individual brandishing a firearm during a verbal argument … which led Young to reveal his own weapon, walk toward them, and pull the trigger.

Detectives were able to identify Young by scouring his social media profiles and YouTube videos … which showed him wearing the same green and yellow teddy bear backpack he allegedly had during the parade.

Detectives also obtained search warrants for two other suspects’ cell phones … and discovered a group chat in which a number believed to be Young’s sent a text that read “I dropped dat n**** first shot.”

Officials got access to Young’s Facebook, as well … and they say it featured videos of him with firearms and other suspects in the shooting.

Young was arrested on Wednesday … and prosecutors requested he be held on $1 million cash bond.

As we previously reported, Lyndell Mays, Dominic Miller and two juveniles have also been hit with charges stemming from the shooting.

Officials now believe all the shooters involved in the incident are in custody … although more charges are expected to come at a later date.