The Los Angeles Police Department released a picture of the suspect, 42-year-old George Turegano of Fontana, because there may be more victims.
Beginning in September 2009, authorities say Turegano would walk or drive up to his victims in street clothes, wearing a badge around his neck and identifying himself as an officer. He carried a handgun and a set of handcuffs.
Authorities said he would rob his victims and run off. All of the robberies occurred in the greater Los Angeles area.
Police said Turegano would sometimes use a gray 2005 Chevy Suburban in his crimes or a gray 2004 Chrysler Sebring.
Turegano was arrested in August for a series of robberies including one in September, three in June and two in July. He was released on bail during his criminal proceedings, but committed another street robbery using the same method in March. LAPD officers arrested him again in April, and he's currently being held on $575,000 bail.
If you have any information about these crimes or if you believe you were a victim, you're urged to contact LAPD at (877) LAPD-24-7.