Timeline of Ismaaiyl Brinsley’s Day Starts to Emerge

Mother of NYPD gunman says his life was spiraling out of control.
2:54 | 12/22/14

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Transcript for Timeline of Ismaaiyl Brinsley’s Day Starts to Emerge
We'll get the latest on the two New York City police officers killed in the line of duty. Vigils and mourning here in new York. Fear across the country. Linsey Davis is on the scene. What we know about the gunman and his last chilling words. Reporter: Good morning, George. Police officers in some of our country's largest cities now being urged to take extra precautions. All because of what happened on this street corner in Brooklyn, New York, after one man allegedly told two bystanders watch what I'm about to do. Police say the ambush happened so fast, officers wenjian liu and Rafael Ramos never saw their attacker coming. A man identified as 28-year-old ismaaiyl brinsley. He's on a bus to New York. Suspected of shooting his former girlfriend earlier that morning. Threats posted on instagram. I'm putting wings on pigs today. They take one of ours. Let's take two of theirs. Making his intentioning very clear with these hashtags. Shoot the police. Rip Eric gardener. Rip Mike brown. Those postings were very anti-police, based on the briefing I had. They would seem to indicate he had a strong bias against police officers. Reporter: According to the NYPD, at 2:37, officers were sitting in their car. Brinsley told two bystanders to follow him. And he walked up to the passenger side of the control car, took a shooter's stance, and fired four shots. Shots fired. Shots fired. Reporter: Striking both officers in the head at point blank range. S.w.a.t. Teams chased him to a nearby subway station. This dramatic video capturing the moment bystanders dropped to the ground in fear. Get on the floor! Reporter: Police say brinsley then shot himself in the head. He has a long criminal history, with more than a dozen prior arrests in Georgia, Ohio, and New York. Brooklyn residents and police united in their grief, mourning the loss of the two officers. Liu on the job for seven years. Just got married a few months ago. Ramos, a husband and father of two. One of his sons posting this, today, I had to say bye to my father. He was the best father I could ask for. It's horrible that someone gets shot dead just for being a police officer. In an exclusive statement, brinsley's mother said her son was a troubled young manned and his life was spiralling out of control. What started out as a few flower yesterday, a massive vigil for the two fallen officers today. George? A lot of support for the police. The killings have widened a

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

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