The incident began with a 911 call at about 1 a.m. from a home in the 7700 block of 3rd Avenue SE in the Tanglewild neighborhood near Lacey. The caller said that a 2-year-old child was unconscious and CPR had been started, said Sgt. Ray Brady of the sheriff's office.
Deputies and medics responded to the scene. The little girl was taken to St. Peters Hospital, where she was pronounced dead.
The cause and manner of death are being determined by the Thurston County Coroner's Office, but it is considered a suspicious death because there is indication of possible prior injuries and bruising on the child that has not been reported, Brady said.
"We are investigating as a homicide," Brady said.
Detectives say 2-year-old victim had recently been sick.
"So, mom had basically gone to bed with the child," Brady said.
A short time later, detectives say mom woke-up and realized the child wasn't breathing.
Investigators say two families live inside the home together with a total of seven children. As for the 2-year-old, detectives say Child Protective Services have an open a file on her, but won't say why.
Neighbors told KOMO News the mother and her daughter just moved there recently.
There was no immediate word of any arrests. The little girl's identity was not immediately released but sources close to the investigation confirm to KOMO News the photo above is the victim.
An autopsy is scheduled for Wednesday and the investigation continues.