Dallas , Texas ( CNN ) -- A man suspected of killing a police officer and another person Sunday night at a suburban Dallas , Texas , apartment complex was the son of the Dallas police chief , authorities said Monday . David Brown Jr. , the son of Dallas Police Chief David Brown , was also killed during an exchange of gunfire with responding officers , Dallas County Sheriff Lupe Valdez said . Lancaster , Texas , Police Chief Keith Humphrey said David Brown Jr. was a resident of the apartment complex . Humphrey also identified the slain police officer as Officer Craig Shaw , who local media said was a five-year veteran of the Lancaster force and the father of two children . Authorities at an afternoon press conference Monday wore black bands around their shields to mark the death of their fellow officer . The incident began when officers responded to a call of a shooting at the complex Sunday . `` According to our investigation , Lancaster officers were called out to a scene and shots were exchanged where two people were killed including Officer Shaw and the suspect , '' Valdez told reporters Monday . `` It appears the shooter is going to be David O'Neill Brown Jr. '' `` Another male victim was also discovered dead at the scene , apparently from a shooting that had occurred earlier , '' Valdez said , adding the younger Brown is also a suspect in that victim 's death . Kim Leach , a spokeswoman for the sheriff 's department , identified the victim as Jeremy Jontae McMillian . McMillian 's role in the incident is unknown , Leach told CNN . Several weapons were found at the scene of the shooting , including a high-powered rifle , Leach said . Charles Cato , the Dallas Police Department 's first assistant chief , said , `` Chief Brown asks that the Dallas community keep his family in their prayers this evening -- and in the days to come -- as his family tries to comprehend the circumstances surrounding this tragic incident . '' Humphrey later added , `` Of course , he 's devastated . But Chief Brown also wanted to make that sure our officers were OK , and especially the family of Officer Shaw . '' Pat Miles lives at the River Bend Apartments , where the shootings happened . `` I just heard lots of quick shots , you know , like , boom , boom , boom , boom , boom , boom , boom , '' she told CNN affiliate WFAA . `` That 's all I heard . I jumped down on the floor . '' Resident Tiffany James said it may have been a case of mistaken identity . `` I heard the officer say , 'Ooh . I shot the wrong person , ' and he busted out crying . Another officer grabbed him and hugged him , '' James told WFAA .
NEW : Police chief 's son also suspected in death of another officer . Dallas , Texas , officer killed in suburban Dallas shootout . Chief 's son also slain during exchange of gunfire with responding officers .