A murder suspect was arrested Sunday night in connection to the killings of a woman and her toddler son in Cloquet. 

Cloquet Police Department said 33-year-old Sheldon J. Thompson was arrested at 8:43 p.m. after an extensive search and investigation that led to a K-9 officer and State Patrol helicopter finding him in a wooded area off Mission Road in Perch Lake Township, Carlton County. 

Thompson was treated for temperature-related issues and then booked into the Carlton County Jail on two counts of second-degree homicide. He is suspected of killing a 27-year-old woman and her 18-month-old boy. 

The victims' bodies were discovered by police inside a residence on the 1600 block of Locke Lane in Cloquet on the Fond du Lac Indian Reservation after a concerned citizen requested a welfare check around 1 p.m. Saturday.

Police say it is believed the victims and suspect had a relationship "or otherwise knew each other."

The identities of the woman and child have not been released and a motive for the double-homicide is unclear. 

Thompson was believed to be armed and dangerous but no weapons were found on him during the arrest.