Olivia Blackmer, 7, was the lone survivor of a Feb. 10 murder-suicide in Byron, Wyoming, by which her three sisters and mother died last week.

Olivia Blackmer died five days after she was shot in the head by her mum Tranyelle Harshman, who also killed her three siblings during a murder-suicide rampage in Wyoming

Olivia Blackmer spent five days fighting for her life after she was shot by her mom in a horrifying murder-suicide that saw her three sisters shot dead but succumbed to her traumatic brain injuries on

The 7-year-old girl shot in the head by her mother during a murder-suicide that killed her sisters has died after five days of fighting for her life in the hospital. Olivia Blackmer died at Primary Children’s Hospital in Salt Lake City on Saturday afternoon,

The 7-year-old surviving sister of a Wyoming mom's murder-suicide that killed her three young siblings has also died. Tranyelle Harshman shot her four daughters on Monday, Feb. 10.

Harshman was found in her bedroom with a gunshot wound to the head but was still breathing when officers entered.

Olivia Blackmer and her three sisters were shot by their mother, Tranyelle Harshman, in their Byron, Wyoming, home Feb. 10 before Harshman turned the gun on herself, according to the Big Horn County Sheriff's Office. Brailey, 9, Brooke, who was almost 3, and Jordan Blackmer, 2, all died at the scene.

Olivia Blackmer, seven, was shot by her mother Tranyelle Harshman, alongside her three sisters, but had been fighting for her life in hospital before tragically passing away