A timeline of events in the hours before and moments after two New York Police Department officers were killed in their cruiser Saturday by Ismaaiyl Brinsley, a 28-year-old man who vowed online to shoot two “pigs” in retaliation for the police chokehold death of Eric Garner.

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5:51 a.m. – Baltimore County police are dispatched to Brinsley’s ex-girlfriend’s home in the Baltimore suburb of Owings Mills, Maryland. Brinsley had shot the 29-year-old woman in the stomach and fled with her phone. She’s expected to survive.

6:05 a.m. – Brinsley calls his ex-girlfriend’s mother and tells her he shot her daughter by accident and hopes she will survive.

6:35 a.m. – Brinsley boards a bus to New York City.

10:50 a.m. – The bus arrives in Manhattan.

12:07 p.m. – Brinsley discards his ex-girlfriend’s phone in Brooklyn.

1:30 p.m. – Police in Baltimore County discover Brinsley has made posts from his Instagram account that threaten to kill officers. They determine the posts are being made from Brooklyn.

2:10 p.m. – Police in Baltimore County call the 60th precinct in New York, advising the NYPD that the phone of a suspect in the Owings Mills shooting is pinging in Brooklyn. The two police departments discuss the Instagram posts during the call, and a wanted poster of Brinsley is faxed to the NYPD with information about Brinsley.

2:45 p.m. – Brinsley walks up to two people on the street in the Bedford-Stuyvesant section of Brooklyn, asks them to follow him on Instagram and tells them, “Watch what I’m going to do.”

2:46 p.m. – Baltimore County Police Department faxes a wanted poster of Brinsley to the NYPD with information about him.

2:47 p.m. – Brinsley approaches the passenger window of a marked police car and opens fire, striking Officers Rafael Ramos and Wenjian Liu in the head, killing them. He takes off running as officers pursue him to a nearby subway station, where he shoots himself in the head.

2:49 p.m. – The Baltimore County Police Department sends a teletype with the same information contained on the wanted poster to the NYPD’s real-crime center at police headquarters.

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Information from: Baltimore County, Maryland, Police and the New York Police Department.

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