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The 11-year-old girl, who was tragically shot with her father, 55, by their neighbor, is depicted

Police identified the 82-year-old man who opened fire on a family at their Florida home – murdering a father and his 11-year-old daughter – before dying in a shootout with authorities.

Guy Alexander Hansman, 55, and his daughter, Harper Hansman, were fatally shot by their neighbor – investigators identified as Ronald Delserro – Monday at their home in Port Lucie.

Police arrived on site on the 2,500 block of Southeast Morningside Boulevard on Monday and exchanged fire with Delserro. He was armed with two pistols, WPTV reports.

Guy Alexander Hansman, 55

11-year-old Harper Hansman

11-year-old Harper Hansman

Guy Alexander Hansman, 55, and his daughter, Harper Hansman, were fatally shot on Monday by their neighbor at their home in Port Lucie.

Delserro was found dead at home by a SWAT team. It is unclear how he died.

The police of Port St. Lucie said the murder was the result of a dispute on March 4 in which the Delseroo mastiff attacked a woman who lived in the victim’s house.

A judge determined that the dog was dangerous.

Harper is said to have called 911 and told authorities someone shot her parents

Harper is said to have called 911 and told authorities someone shot her parents

Harper is said to have called 911 and told authorities someone shot her parents

“I think this is a deliberate act of violence against these neighbors,” Port St. Lucie’s assistant police chief, Richard DelToro, said Monday. “It is tragic. You cannot rationalize irrational behavior. ‘

Friends and loved ones shared photos of the two victims in tribute on Facebook, with neighbors initially posting photos of Harper.

Researchers were still processing the scene on Tuesday. Port St. Lucie Animal Control arrived on Tuesday around noon to pick up the dog.

Police said the murder was the result of an altercation on March 4 in which Ronald Delserro's bull mastiff attacked a woman at the victim's house

Police said the murder was the result of an altercation on March 4 in which Ronald Delserro's bull mastiff attacked a woman at the victim's house

Police said the murder was the result of an altercation on March 4 in which Ronald Delserro’s bull mastiff attacked a woman at the victim’s house

Port St. Lucie Animal Control arrived on Tuesday around noon to pick up the dog

Port St. Lucie Animal Control arrived on Tuesday around noon to pick up the dog

Port St. Lucie Animal Control arrived on Tuesday around noon to pick up the dog

A contractor said he saw the shooter’s wife shortly after the gunfire happened.

“She said, I hope he didn’t do anything stupid,” said Ray Layfield.

Police initially reported that the girl was 13 years old.

The authorities briefly rushed to a house on the 2500 block of SE Morningside Boulevard in Port St. Lucie at around 12:30 PM when a girl called and said someone was shooting her parents.

A Florida man and 13-year-old girl were shot dead Monday after a fight with a neighbor over his dangerous dog

A Florida man and 13-year-old girl were shot dead Monday after a fight with a neighbor over his dangerous dog

A Florida man and 13-year-old girl were shot dead Monday after a fight with a neighbor over his dangerous dog

Police rushed to the scene in the 2500 block of SE Morningside Boulevard in Port St. Lucie after the girl called 911 and said someone shot her parents

Police rushed to the scene in the 2500 block of SE Morningside Boulevard in Port St. Lucie after the girl called 911 and said someone shot her parents

Police rushed to the scene in the 2500 block of SE Morningside Boulevard in Port St. Lucie after the girl called 911 and said someone shot her parents

“If you heard this emergency call, the hair on your neck would rise. A little girl calls 911 and says someone is shooting into our house, I think our parents are dead. “I think our family is dead,” said Sheriff Ken Mascara of St. Lucie County.

He said officers had already found the adult male victim dead in the garage, adding that the 11-year-old girl was seriously injured and later died in a hospital.

The shooting seemed to stem from a dispute over a dog, said Port St. Lucie Police Assistant Chief Richard Del Toro.

“The dog was declared dangerous in court today and he owned the dog and he went there to confront his neighbors and this is what happened,” said Del Toro, according to Treasure Coast newspapers.

At least two other victims managed to escape from the house and were taken to hospital. Their conditions are unknown.

Authorities said that a police officer from Port St. Lucie also sustained a gunshot wound to his arm during the shooting. He is expected to recover.

Port St. Lucie, police chief Richard Del Toro, said the shooter dog was declared dangerous by judge Monday morning.

Port St. Lucie, police chief Richard Del Toro, said the shooter dog was declared dangerous by judge Monday morning.

Port St. Lucie, police chief Richard Del Toro, said the shooter dog was declared dangerous by judge Monday morning.

“Our agents met the suspect in the victim’s house,” said Del Toro. “Our agents and a deputy, who worked at the school across the street, immediately responded to the place and exchanged gunfire with the suspect.”

Police said the shooter barricaded himself in the victims’ house for two hours before a SWAT team entered the home and found him dead in a second-floor bedroom, reported CBS12.

Officials did not immediately identify the victims, the alleged gunman or the officers.

“It is shocking and tragic. It’s not typical of this neighborhood or the city, but we’re going to do everything we can to find all the reasons why, ”said Del Toro.

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