The two other victims have only been identified by police as an adult man and woman.
Fredericton police say they will not be releasing the names of the shooting victims at this time.
Mr MacCoubrey said his apartment complex has four buildings in a square, and it sounded like the shots came from the middle of the complex.
"There is a police officer standing outside with a gun", CTV Atlantic's Nick Moore said on CTV's "Your Morning".
"We were looking forward to building years with just the two of us", she said. They also said a suspect was treated for serious injuries.
Residents of the Brookside neighborhood of Fredericton, New Brunswick woke to the sounds of multiple gunshots.
Tim Morehouse, a resident of the neighbourhood, said he was in his apartment when he heard someone shout: "Shut up!"
McLean said she didn't know yet when a funeral might be held but she knew what Costello would want. "It was like they were right in my parking lot".
Gaudet said the investigation, which is being handled by the RCMP, is ongoing.
"My adrenalin was going like a bat out of hell".
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"Every time I dealt with Constable Burns or Constable Costello, they were A1", Mr. Gaines said.
Const. Robb Costello would often tell his spouse that no matter what happened to him on the job, he would always come home.
One local resident, Robert DiDiodato, told CBC that at around 7 a.m. he heard a "firecracker" type sound.
Our hearts are broken by the murder of our two fearless police officers. "It's bad. It could be any of us at any time", Forget said.
'With the tempo, it might've been a gunshot, ' he said.
"He said the street was all blocked off with cops". Locals have been advised to avoid the area and remain indoors with their doors locked as a search continues. "Make sure the door is locked and don't go to the door, not matter who is at the door". "I guess I slept through it. I slept through it".
Ms. McLean said her partner had planned to retire in the next six to seven years.
"I'm still timid about going out", she said at 3 p.m.
"I'll be staying here".
David MacCoubrey was asleep in his apartment on Brookside Drive when three shots echoed through the morning calm mere metres from his bed.