Robert “Bobby” E. Crimo III, the person of interest identified by police after Monday’s shooting in a Chicago suburb that killed six people and wounded 38 others, left a long trail of tributes to mass shootings and public killings on social media platforms, according to numerous profiles that appear to belong to him.

Crimo performed as a rapper who went by the name “Awake,” whose recent music videos included depictions of mass murder.

Crimo’s most recent video posted to YouTube showed him in the aftermath of a school shooting. It ends with Crimo draping himself in an American flag. Another music video showed a cartoon depiction of a man wearing a shirt with his YouTube channel’s logo on it, holding a long gun and being shot by police.