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Investigators continue their search Monday for 44-year-old Roderick Clifton and his 46-year old girlfriend, Paula Lane.

The two were last seen leaving Roderick’s mother’s home in Citrus Heights, headed to Lane’s home in Gardnerville, Nev. Citrus Heights Police, the El Dorado County Sheriff’s Department and the California Highway Patrol have partnered to search for the couple by helicopter.

“We have not found them yet, we are still looking and we will look until we find them,” Eric Mattke, of the Citrus Heights Police Department, told FOX40.

Helicopter crews are searching along the 50 between Pollock Pines and Lake Tahoe Monday, the route the couple is said to have taken.

“I don’t know where he is,” Clifton’s mother, Lois, weeps. “A child is not supposed to die before their parent, I cannot bury my son.”

If you have any information on the couple’s whereabouts, contact the Citrus Heights Police Department.