undercover police officers nearby. and because of that, there has now been an arrest in the petworth attack. and at this point, they are relating this arrest to just this latest attack that happened last night. and the suspect has been identified as 19-year-old michael davis. 900 block of emerson. here s about what we know about ha happened in the past. the violent murder that happened this past tuesday at 6:00 p.m. involved a 66-year-old man gamed gary dedericks of colorado, he died from his injuries. wednesday at 3:00 a.m., a 53-year-old male was found unconscious in the roadway in the 4800 block of georgia avenue. he was suffering from head trauma and remains in critical condition. on wednesday evening, an adult female was assaulted while in the 5600 block of ninth street northwest. struck in the head by a blunt object and remains hospitalized. last night, undercover police patrolling petworth heard the screams of the latest victim, rushed to the scene, saw their suspect a