Who Is the Alleged Brooklyn Shooter, Ismaaiyl Brinsley?

Chilling messages from the alleged gunman were posted online prior to the shooting.
2:03 | 12/21/14

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Transcript for Who Is the Alleged Brooklyn Shooter, Ismaaiyl Brinsley?
Now to more on those chilling messages brinsley posted online before heading north from Baltimore where he shot his ex-girlfriend. Bazi kanani continues our coverage in Owings mill, Maryland. Reporter: Baltimore county police say the woman shot inside her apartment is expected to survive and hope she can tell them more about the shooter as they try to figure out his motive. The last Facebook post from ismaaiyl brinsley seemingly foreshadows a violent ending. "I always wanted to be known for doing something right. But my past is stalking me and my present is haunting me." Investigators saw combing over the 28-year-old's social media accounts to look for what led to his rampage. On a dating website, brinsley is pictured behind a camera. He calls himself a film director and free thinker. No indication of his criminal record in three states, arrested multiple times on theft, assault and weapons charges. Really trying to learn as much as we can as quickly as we can about this individual. Reporter: Police say the new York native was most recently living in Georgia. No details yet on his relationship with the former girlfriend he allegedly shot in her Maryland apartment. But it was her mother who tipped off police that he was posting on instagram just before that grisly New York ambush. A picture of his hasn't leg with bloodstains. A picture of a handgun, references to Michael brown and Eric garner who died at the hands of police and this clear threat, "They take one of ours, let's take two of theirs." #Shootthepolice. Some of the postings which I I understand are out there would seem to indicate he had a very strong bias against police officers. Reporter: The brown and garner families and several of the organizers of the anti-police brutality protest immediately condemned brinsley's attack and say they are now praying for the officers' families.

This transcript has been automatically generated and may not be 100% accurate.

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