12/23/2014 07:15 EST | Updated 02/22/2015 05:59 EST

David Jean Cottard, 42, reported missing by Montreal police

Montreal police are searching for a potential witness in the disappearance of a 42-year-old man missing since Dec. 15.

Investigators say Cottard, a Joliette resident, stepped out for air on his lunch but never returned to his downtown workplace, and never came home that night. 

The woman is identified as white, in her 20s, with brown hair. Police say she was seen at ComplexeDesjardins, on Ste-Catherine Street West, at around 1:30 p.m. on the same day Cottard disappeared.

She was wearing a pale, fur-lined winter coat at the time. 

Police believe she's the last person who saw Cottard before he disappeared.

Anyone with any information about the woman or Cottard's disappearance is asked to phone Info-Crime Montréalat 514 393-1133.