Quebec provincial police have arrested a man whose father and father's girlfriend were found dead in a home in Terrebonne, just north of Montreal, yesterday. 

Guillaume Gélinas, 22, will be charged with first-degree murder and is expected to appear Monday at the courthouse in Joliette — which is about 70 kilometres northeast of Montreal.

Police located Gélinas, 22, late Thursday near the Quebec-Ontario border.

The bodies of Luc Gélinas, 54, and his companion Julie Lemieux, 35, were found by municipal police in the couple's home on Pierre-Le Guardeur Boulevard in the Lachenaie area of the city Thursday morning.

The Sûreté du Québec began looking for Gélinas' adult son shortly after the discovery.

Man slain on his birthday

According to CBC's French-language service, Radio-Canada, both victims worked for Quebec's liquor board, the Société des alcools du Québec, and Gélinas was celebrating his birthday Thursday.

Late last night, a wide perimeter around the couple's home remained cordoned off, and investigators with the SQ's major-crimes squad were still on the scene, trying to piece together what might have happened inside the house.