A 4-year-old girl who was accidentally shot by her 3-year-old brother last week has died.

Izabella-Marie Helem died Tuesday of injuries she sustained in the Nov. 29 shooting, the Lebanon Police Department said in a news release.

Police said last week that the shooting was reported about 10:10 a.m. at a home in the 300 block of North Park Street in Lebanon. It happened while Izabella-Marie and her brother were being cared for by their grandparents at their residence, according to the news release.

Izabella-Marie was shot after her brother found the weapon, which had been left unsecure at the home, the release said. It's unclear where he found the weapon. Sgt. Ben Phelps told IndyStar the weapon, a handgun, was "easily accessible" to the boy.

Officers found Izabella-Marie suffering from a gunshot wound to the head. She was taken to Riley Children's Hospital in critical condition. No one else was hurt in the shooting, police said.

A preliminary investigation revealed one wound on her left shoulder blade and another on the right side of her head, the release said. The Marion County coroner's office will perform an autopsy to determine where the bullet entered and exited the child, and the path it traveled, police said.

It wasn't immediately known whether criminal charges will be filed. Police say investigators are wrapping up their investigation into the shooting.

When the investigation is concluded, their findings will be turned over to the Boone County Prosecutor’s Office, police said in the release.

Call IndyStar reporter Crystal Hill at 317-444-6094. Follow her on Twitter: @crysnhill.

