(CNN) — when Tatiana Jefferson’s neighbor called police, he said he expected them to go check and see if she was okay.

But the officer who shot her in her own home was sent on a call that police often handle as a potential burglary.

“The information came from a neighbor to callers and while it was passed to the control room, it was determined to be an open call structure,” Fort worth interim police chief ed Kraus told reporters Tuesday.

Experts say the classification escalated things beyond welfare checks, and meant officers would react differently.

Many times a welfare check involves a medical emergency, an elderly person living alone or a relative who is difficult to get ahold of.

These calls are usually answered by police officers knocking on someone’s door and waiting for an answer. But a COP’s mentality changes when they hear it’s an “open structure “or” open door ” call.

Michael “Britt” London, President of the Phoenix law enforcement Association, says officers have a more cautious approach and run through several scenarios in their heads. They can be presented with the simple case of a door left unlocked, an abandoned house, or a burglary in progress.

The first thing that comes to mind is burglary – which is why officers are looking for signs of forced entry, like a broken window or a damaged door.

Body camera footage from that night shows Dean, 34, peering through two open doors and walking around the perimeter of the house. Then he pointed his weapon at the window and shouted, ” Put your hands up! Show me your hands!”in just a few seconds before he opened fire, striking Jefferson.

He resigned from the Department on Monday, and was arrested and charged with murder. His attorney, Jim lane, told CNN the former officer is remorseful.

“My client is sorry and his family is in shock,” lane said.

‘They never have both doors open’

Jefferson’s neighbor told the Fort worth Star-Telegram that he was worried to see the front door open late at night, so he called the non-emergency police line. But he didn’t mention a possible burglary.

“Well, the front doors have been open since 10 o’clock. I didn’t see anyone move. It’s not normal for them to have both doors open at this time of night, ” Jefferson’s neighbor said, according to audio of the phone call released by authorities.

“Well, do you know if someone is inside?”The police call asked him.

The neighbor continued to describe the vehicles and also confirmed his name and phone number.

“Are they usually at home at this time?”The Callsign later asked him.

“They are usually at home, but they never have both doors open,” a neighbor told her. “The light is on, I can see through the house. My sister woke me up, she lives across the street from them. I live on the opposite side of my sister.”

Officer’s behaviour was “extremely disturbing,” says former chief

Jeff Halstead, a retired Fort worth police chief and police consultant, said there was nothing in the body camera footage released after the shooting suggests there was a crime going on.

“They were standing literally at the front door, they could see if the door was kicking or not. The lights were on, there was evidence that people lived there, there were toys, ” Halstead said.

“Why did they go out into an extremely dark courtyard area, at least ringing the doorbell or checking the entrance? It’s very disturbing.”

Dean’s experience as a police officer could have factored into how he acted during the call, Halstead said.

“Some officers, young officers, think every call is an extraordinary risk or a loud call,” he said. “With seniority, maturity, experience, you can adjust your mentality in approaching a lot of different calls.”

Dean was hired in August 2017 and commissioned as a licensed officer in April 2018.