Hi Patti, I'm unsure about the scarf,I'm not sure but think his wife may have had something to do with the scarf.
The possibility or likelihood of her knowing her killer is what makes doug Senecal interesting. His sister I believe it was said she thought it was him that killed her. He was already on a charge of being accused of molesting his step daughter,who was related in someway to Sarah cherry,so you would think senecal would be a familiar face to Sarah.