An intruder who was shot dead by a homeowner after breaking in and using the shower has been identified as a 31-year-old teacher's aide.

Nathaniel Joseph Rosa was killed on Saturday morning inside the bathroom of a property in Belfair, Washington.

The man who owns the property has been charged with murder.

Police said the homeowner, who has not been named, called 911 shortly after 8am on Saturday and told the dispatcher he had shot an intruder.

Nathaniel Joseph Rosa, 31, was shot dead on Saturday morning inside the bathroom of a property in Belfair, Washington after he allegedly broke in and took a shower

The man owns two pieces of property next door to each other. He lives in one house and runs an internet-based business next door, which is where he found the intruder.

He told police he noticed signs of forced entry when he went to work on Saturday.

The man said he went inside and found Rosa using the shower.

Police said the homeowner confronted Rosa and the pair exchanged words before he left and returned to his house next door to retrieve his gun.

The man then allegedly came back to the property and fired multiple rounds into the shower, killing Rosa, according to Mason County Sheriff's Lt. Travis Adams.

He then called 911 to report the shooting.

The man who owns the home (above) where Rosa was found has been charged with murder after opening fire on the teacher's aide in the shower

Rosa worked as a teacher's aide at Woodmoor Elementary School in Bothell - about 80 miles from where he was shot dead

Police said the homeowner confronted Rosa (right) and the pair exchanged words before he left and returned to his house next door to retrieve his gun

Detective have argued the homeowner had plenty of time to call authorities during the time he went home, retrieved his gun and returned to shoot Rosa.

They also do not believe the man gave any warning to Rosa - who was not believed to have been armed at the time - before he opened fire.

The homeowner has since been arrested and charged with second degree murder.

According to his Facebook, Rosa worked as a teacher's aide at Woodmoor Elementary School in Bothell - about 80 miles from where he was shot dead.

Mason County Coroner Wes Stockwell told the Kitsap Sun that Rosa had been visiting his mother who lives in nearby North Mason.

Shocked family and friends paid tribute to the slain man on Facebook following news of his death.

'Rest in piece Nathaniel Rosa. I don't think I ever heard you say one negative thing about anyone nor did I hear anyone say anything negative about you. You will be greatly missed,' one person wrote.

Detective have argued the homeowner had plenty of time to call authorities during the time he went home, retrieved his gun and returned to shoot Rosa

Authorities do not believe the man gave any warning to Rosa - who was not believed to have been armed at the time - before he opened fire

His niece wrote: 'My dear Uncle Nathaniel Rosa no words can describe or say how it feels to learn what happened. You were the nicest person and the best uncle. I hope to see you one day again. Until then I love you and will miss you with my heart.'

Mason County Sheriff's posted on Twitter on Saturday saying: 'Lots of reactions to the arrest. There is more to the story that can not be released yet. You may reserve your judgement until facts are out.'

Investigators said the homeowner is cooperating with detectives.

'Certainly he had an opportunity to call law enforcement at that time,' Adams said.

'We've contacted our local prosecutor, explained the circumstances to him, and he agrees that 2nd degree murder was an appropriate charge in this case.'