Bellevue boy, Sky Metalwala, vanished eight years ago as of this Wednesday.
Metalwala's mother, Julia Biryukova, said she left the 2-year-old in her car while she went to a gas station after she ran out of gas on November 6, 2011.
She told investigators when she got back about an hour later, he was gone. The boy hasn't been seen since.
>> See a timeline in the case here.
Background on the case
Bellevue police found there were 2.2 gallons of gas in Biryukova's car and it had no mechanical problems.
Investigators said during the search of Biryukova's car and home, no gas can was found. Authorities said they also learned that the child had not been seen by anyone for about two weeks.
>> Related: Mother of missing boy has another child, feared 'at risk'
In 2014, the National Center for Missing and Exploited Children released an age progression photo showing what the boy would look like now at the age of 6.
The boy's father on the case
Sky's father, Soloman Metalwala, and Biryukova had gone through a bitter divorce that was finalized a few days before the boy's disappearance. In divorce papers, Metalwala claimed Biryukova had told him of dreams she had about killing their children.
In the same papers, Biryukova said Metalwala had been abusive to her and their children. They were also in the midst of a custody battle for the two children.
>> Lawyer for Sky Metalwala's father says it's time mother's family came forward
Police said though foul play was suspected, there were no suspects in the case.
>> RAW VIDEO: Lawyer, father of Sky Metalwala, talk about case in 2012
The case now
Bellevue police continue to ask Sky's mother for her assistance in the case.
To date, investigators with the FBI, Bellevue Police Department, and Redmond Police Department have pursued over 2,500 tips, spent over 14,000 hours, and over 2 million dollars in this lengthy investigation; however Sky remains missing.
>> PHOTOS: See photos of sky before his disappearance
Bellevue Chief of Police Steve Mylett made it clear that Sky's mother holds the key to this case. He renewed his plea on Thursday.
"Ms. Biryukova please contact the Bellevue Police Department to allow us the opportunity to help find your son," Mylett wrote.
"We are more than willing to work with you and your attorney to identify a convenient time and location to discuss Sky's disappearance. I am convinced you hold the key to finding Sky. The employees of the Bellevue Police Department will not stop searching for Sky, but I cannot emphasize enough the role you play in successfully locating your little boy. As you know, many people have been impacted by Sky's disappearance and I know they would all welcome your active participation in this investigation. If you decide to accept this sincere invitation, please contact my office directly."
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