The father of missing toddler Ayla Reynolds pleaded guilty last month to operating under the influence on Route 1 in Damariscotta.

Justin DiPietro, 28, of Waterville pleaded guilty to Class D criminal OUI on Dec. 17, 2015, according to court documents. He was ordered to pay a $700 fine and his license was suspended for 150 days.

DiPietro was arrested and charged with OUI on Route 1 in Damariscotta at 9:33 p.m. Nov. 6, according to court documents. Lincoln County Sheriff’s Deputy Ryan Chubbuck was the investigating officer.

Lt. Rand Maker said Chubbuck made the stop after the department received a complaint about the operation of the vehicle. After conducting a field sobriety test, Chubbuck took DiPietro to Two Bridges Regional Jail in Wiscasset.

DiPietro’s blood-alcohol level was 0.13 grams per 210 liters at the time of the arrest, according to Maker. In Maine, it is illegal to drive with a blood-alcohol level of 0.08 or more.

On Dec. 17, 2011, 20-month-old Ayla was reported missing by DiPietro. Ayla was in DiPietro’s care at his home in Waterville at the time of her disappearance.

After blood belonging to Ayla was found inside the basement of DiPietro’s residence, investigators from the Maine State Police said they believe the toddler no longer is alive.

The Maine State Police have said they believe DiPietro knows more than what he has told investigators and that he is no longer cooperating with the investigation.