The missing man has been identified as 42-year-old Charlie Petterson of Ottawa. He hasn’t been seen since Wednesday, when police found his spouse, Liliana Casillas, and two children, Ixchel, four, and Ethan, seven, in the family home in Tuxtla Gutierrez, according to Jose Domingo Perez, a spokesman for the Chiapas state police.

Hypodermic needles containing an unknown substance were apparently found at the scene.

An arrest warrant has not been issued for the missing man but police are still eager to speak with him. Petterson taught tennis and English in Tuxtla Gutierrez, according to police, and his wife was originally from the west Mexican city of Guadalajara.

The Canadian Foreign Affairs department has been notified of the case, but was unable to provide any details, citing privacy rules.

Meanwhile, the search for a suspect in another case with a Canadian connection is still underway.

Eddie Greenspan, the lawyer representing the family of Dominic and Nancy Ianiero – whose throats were slashed at a Mexican resort last February -  recently lashed out at Mexican authorities for their handling of the investigation.