Tragedy struck in a San Diego park when a playful afternoon turned fatal for a young boy. A four-year-old, Ronan Kerr, lost his life after a massive tree branch collapsed on him.

The unfortunate incident occurred at Villa La Jolla Park in June, when a eucalyptus branch fell from a height of 60 feet, hitting Ronan on the head.

Ronan was enjoying a day out with his father, Cathal Kerr, and his seven-year-old brother, Charlie, when the 34-foot branch unexpectedly snapped.

In a desperate attempt to shield his sons, Cathal tried to whisk them away to safety but couldn’t prevent the tragic outcome, as detailed in a wrongful death lawsuit he has filed against the city.

Cathal himself suffered serious injuries, including a traumatic brain injury, facial cuts, and several broken bones.

Despite being rushed to Rady’s Children Hospital with severe injuries, Ronan succumbed to his wounds a week later, leaving a family devastated by loss.

In their lawsuit, filed earlier this week, the family accused the city and its arborists of failing to properly maintain the tree. 

Two city contractors were also named in the suit, seen by The San Diego Union-Tribune, which claims the tree was unhealthy, decayed and had deadwood. 

Ronan Kerr, four, died from his injuries after being struck on the head by the falling branch at Villa La Jolla Park

The young boy was struck on the head by the above branch that broke off 60 feet above him, his brother and father 

It said: ‘The tree’s branches and limbs were large, elongated, heavy, angled and improperly maintained to the point that it was obvious to a trained eye that the tree would catastrophically fail.’

The complaint lists over 30 instances from 1983 to 2005 in which tree branches or eucalyptus trees have fallen in the city, including Villa La Jolla park. 

The suit highlights a four-year-old girl who was killed in 1983 at the entrance to the San Diego zoo.

It added: ‘Eucalyptus trees in San Diego parks were posing significant dangers to the public. 

‘The city’s inspection and maintenance protocols were grossly inadequate to identify hazardous trees before they failed.’

The suit is asking for financial damages and requesting that all eucalyptus trees that are dangerous to removed or properly maintained. 

Ronan’s family described him as ‘a bright light’ who was ‘full of heart, humor, and boundless curiosity’ in a heartbreaking obituary.

The young boy is survived by his mother Dara, left, and his father Cathal, right, who had tried to save his son during the horrific incident

Ronan died seven days later at Rady’s Children Hospital

His father Cathal, seen here, suffered a traumatic brain injury, lacerations to his face and multiple broken bones

The family are calling for all trees in the city to be properly inspected with reports made public, Villa La Jolla Park is seen here

‘His hugs, his giggles, the way he melted into you when he snuggled – these are the things that will echo forever in the hearts of those who loved him. 

‘Ronan may have only been here for 4.5 years, but he lived with a presence that felt bigger than life. 

‘He changed us. He taught us about joy, resilience, tenderness, and how deeply a child can love and be loved’, it said. 

The suit asks for all trees to be properly inspected in a timely manner and that inspections and assessments of trees be made public on the city’s website. 

The Daily Mail has contacted the family and the city for comment.