Marin County sheriff's investigators on Tuesday evening released surveillance video that shows two of the three people they want to question in the shooting death of 67-year-old Steve Carter. The surveillance footage taken from a convenience store in Fairfax shows a long-haired man wearing a black hat and a woman with dirty-blond hair, wearing dark clothing. The couple released DVDs on Tantric massage, yoga for lovers and meditation. Logan Rose, director of the Ecstatic Living Institute, said the Carters recently led retreats for couples in Costa Rica and had come to Marin County so Lokita could undergo treatment for breast cancer.