Surveillance video appears to show missing woman Taneesha Brown at a Markham high school on the night she disappeared, York police say.

Police say the video, taken from a camera at Bur Oak Secondary School near Bur Oak Avenue and Markham Road, appears to show Brown walking and speaking with an unidentified man shortly before 10:50 p.m. on Jan. 12. She is seen dressed in white carrying a black bag.

The man is not a suspect, investigators say, adding he is believed to have attended an event at the high school that night. Police say they would like to speak with the man, who is seen in the video wearing a dark coat.

After a brief conversation with the man, Brown walked away, southbound towards 16th Avenue. As a result, York police's marine unit will be checking areas of open water in the partially-frozen ponds west of the high school Monday, investigators say.

The 25-year-old woman left her aunt's house in the McCowan Road and Castlemore Avenue area around 10:30 p.m., saying she was going out for some fresh air. She did not return.

"To Taneesha, if you're watching TV, just give your family, your siblings, a call. We just want to make sure you're OK," her father pleaded last week

Brown is five feet five inches tall and weighs about 122 pounds, with shoulder-length black hair and pink highlights.

She left her aunt's house wearing a traditional Muslim outfit of a white, knee-length dashiki, with white pants and a white hijab. She was carrying a black purse.