Constable Marcus "Mark" Rodriguez is an RCMP officer in the town of Hudson, Alberta.
Amy met Mark when she helps him save a child from drowning in the Sheep River. Later when Amy works with his horse to overcome fear of water, she discovers that it is the same river where Mark's brother drowned.
Later he starts dating Lou. Just as Lou starts to get really attached to Mark, she catches him in the city kissing another woman. Lou ends their relationship immediately.