Five of the men were struck from behind while walking in downtown Waltham. The other five victims were attacked outside an apartment complex north of the downtown district. The attacker hit David Cameros in the head as he smoked a cigarette outside his apartment. The baseball bat fracture Mr. Cameros' skull. Another victim was attacked nearby while taking out the trash. He was also severely injured and hospitalized.
As of December 1, 2020, the Waltham Police have not identified the baseball bat wielding man. The best lead they have is a surveillance camera video of the assailant running down the street.