Shaheen Syed, 21, came came under scrutiny from the police after his father, 51-year-old Muhammad Atif Syed, was charged with two of the Muslim murders. He may have been working with his dad.
Three Muslim men have been killed in Albuquerque in similar circumstances since November - the latest victim murdered on Monday. Police say there is a strong possibility the same killer is behind all.
Albuquerque Police Chief Harold Medina confirmed that a fourth Muslim man was murdered on Saturday after midnight as the FBI investigates the possibility of a serial killer targeting Muslim men.