A massive multi-agency manhunt including the FBI and U.S. Marshals was launched in Austin on Sunday for an armed former sheriff's detective wanted for killing at least three people near an apartment complex.Austin police said that the three lifeless bodies were all adults, including two Hispanic females, and one Black male. They said they believe the suspect is Stephen Nicholas Broderick, who is a former Travis County Sheriff's Office detective that was charged with raping a 16-year-old girl last summer. The Austin Police Department said the suspect was still on the run Sunday evening and is considered armed and dangerous.