Tomorrow will mark one month since he was shot and killed by Fort Lee police after officers were called to her home during a mental health episode.

Alice Gaynor spoke with Lee's father about his daughter's life as he demands accountability for her death.

I could not believe that until even at the funeral time, still.

I don't believe my daughter is dead.

K.Y. Lee says his daughter, Victoria Lee, loved music.

She composed, sang, played cello, and interned at a music studio.

Daddy, listen to me, I made this music.

The 25-year-old, he says, also had a diagnosis of bipolar disorder that had gotten worse.

K.Y. Lee says Victoria lived with her brother and that usually she would call her mother if she wasn't feeling well.

So on July 28th, his wife went over to calm Victoria down.

She's worried that her condition become uncontrollable.

Her brother called 911 to ask for an ambulance since Victoria had been hospitalized in the past.

The dispatcher told her brother police would be sent.

He called back to try and cancel the call.

My daughter doesn't like police to come.

Lee says she picked up a foldable knife used to open packages to protest this.

Never any violent outbursts toward any family member, anybody?

Never until her death never happened.

That's the first time.

I'm going to break the door down.

I'm going to break the door down.

Go ahead, I'll stab you in the f***ing neck.

Sir.

Sir.

Demetrius, step back.

Step back.

We don't want to shoot you.

We want to talk to you.

Lee feels officers escalated things and could have waited to find out more about the situation.

Mental health professionals need to be there from the very beginning.

My daughter already put down the knife because my wife persuaded her.

She had a fear, you know, anxiety and then anger.

Who wants to go last?

Who wants to go last?

Who wants to go last?

Who wants to go last?

Who wants to go last?

Who wants to go last?

Who wants to go last?

A few seconds later.

Drop the knife.

Drop the knife.

We're freezing the video before police fire a shot, killing Lee.

It's unclear from this video if a knife was in her hand.

The New Jersey Attorney General's office announced a change to the use of force policy, among other things requiring police departments to coordinate with mental health professionals and train in crisis negotiation.

It is welcoming.

Welcoming, yes.

But if they have done that like earlier, then my daughter would be alive now.

Lee wants the Fort Lee officers involved held accountable.

In Fort Lee, Alice Gaynor, CBS News, New York.

And the New Jersey Attorney General's office is investigating the shooting.

We reached out to Fort Lee police to find out the status of the officers involved.

They would not say, instead directing us to file a request for records.

And our team has been following the investigation into Victoria's death and other deadly police shootings involving mental health crises.

You can find all of our reporting at cbsnewyork.com.