Suicide pact. Suicides have strange planning. The two would choose a hotel rather than their homes, because there is no chance of anybody visiting. If there was a chance of anyone coming in, looking in, or raising the alarm because nobody came to the door; all risks, among others, resulting in one or both being saved; the pact would fail. The injuries, 'slash wounds' ,as reported, suggest a wish to bleed to death. That there is no known motive for a suicide pact does not alter this finding; suicides commonly have no apparent motive. And the police didn't think anyone else was involved. There was plainly no sign of a struggle, and any outside murderer would have to know where they were; if not, he'd have to have, or get, access to the room and kill them in the course of robbery or be some wandering pyschopath