SNELLVILLE, Ga. -- Snellville police said the person who killed a young mother wore a wig and a fake mustache.

Heather Strube, 25, of Conyers, was gunned down in the parking lot of the Target store on Ronald Reagan Parkway Sunday night.

Snellville Police Chief Roy Whitehead said Strube had just picked up her 18-month-old son during a custody swap when another man approached her.

Witnesses told police Strube argued with the gunman before she was shot in the head.

Detectives said they hope surveillance video will lead them to a suspect.